Is this for a RTW trip

I would take the following spares for the DR650SE and a trip let's say 20000km Cape to London:
Hand brake and clutch levers. Gearshift and foot brake are steel and easy to repair. Also well protected by my sumpguard.
Front and rear brake pads 0.4kg (bolted inside the sump guard) Not. Fit new before trip.
Clutch cable (along side original). As above
Fork seal (only one, buy two at the next parts place and replace the other one there). Not necessary on a new bike wioth fork boots. Fit new if the bike is older than 8 years.
Counter shaft seal (about the only rotary seal on the motor). Maybe. Small & light.
Oil filter 0.05 kg - Yes
Spark plug (under fuel tank) - Yes, two of them, DR650SE is twin spark
Spark plug cap (under fuel tank) - No, fit new cap and HT leads if bike is VERY old
Lower chain slider (luggage rack) - Not sure what that's meant to be

swing arm chain slider (?) Fit new before trip depending on wear.
Chain links and short length of chain(?) - Yes and a chain press too
Front sprocket (inside sprocket cover) - No. Check on availability or possibility to airmail chain & sprockets to predetermined place. Very heavy to carry on the bike.
Gear lever (bolted to rear master cylinder protector) - See above
Rear tube 500 17 (front mud guard) - Yes
Globes (inside front headlight shroud) - No, available everywhere, break easy, you can even ride on high if your low beam pops or without brake or tail light for an hour or a day.
Fuses (along side fuses in use) - Yes, bike comes with spares, take another one or two
Oil Drain washers (behind frame plugs) _ Yes
Fuel filters - Fit one, take one spare. Use decent big paper filters like fitted in old Citigolf et al. You can even skip the spare as they are also readily available especially in countries with dodgy fuel (at every coop)
Collection of nuts and bolts as used on the bike - Maybe bolts for frame covers but if you lose one the frame cover will most probably be gone too

Spare bolts for luggage rack yes.
Tyre tube, I carry a rear as that is where I get my flat tyres. Most advice is to carry a front as that will also fit the rear if needed. - Carry both a spare for the front and rear. An incorrect size tube is a bitch to fit and a very dicey solution to save a few hundred grams and space the size of two coke tins.
Possibly a trigger coil for the ignition? - Fark, maybe also a spare engine?
Universal repair parts (consumables)
Araldite - No, limited use, readily available.
Metal epoxy The HUBB on metal epoxy, add your comments here.
Silastic (RTV 732 etc) Rather Würth Engine silicone. But I would not take it with, rather get it send same as gaskets if needed. If you have to do serious repairs you won't do it in the dirt on the side of the road and also won't bother waiting a few days for stuff to arrive. Better than finding your silicone perished or leaked over your socks

Duct tape
Electrical tape
Tyre patch kit
Bailing wire
Electrical wire
Solder - You solder on the side of the road

Grease (wheel bearing, copper slip, petroleum jelly) Petroleum jelly? At every pharmacy.
Cable ties
Hose clips [Jubilee Clips] (sizes from 10 (fuel line) to 30 mm (exhaust/frame tubing) - Maybe for enmergency repairs on carrier rack. Only three or four big and strong ones.
Tools
Open end spanners (8x7,10x11,12x14,13x17) No, see below.
Rings spanners (10x11,12x13,19,24) [may remove the 19 and 24 - see sockets] - No, Take open box type spanners 10, 12, 13(?), 14, 17, 19, 24 (27?)
Tube spanner (16? spark plug) - 3/8" drive 16mm plug socket or deep 16mm socket, both fit onto spark plugs.
1/4 inch sockets (17,19,22) [would like 24?, maybe an 8?] - 1/4" is tinkytown toys. Take good quality 3/8" drive and sockets 8mm, 10, 12, 13(?), 14, 17, 19, 22, 24, some US spec DR's have 27mm on the rear axle, check.
1/4 inch tee bar - See above, 3/8"
Screwdriver (multi driver) - No, take a good quality Philips or even better replace all the Japanese nails on the bike with stainless allen capscrews. Maybe a big flat screwdriver to chisel, pry and dig
Allen keys (10,8,6,5,4,3,2.5,2,1.5 mm) - No, Park tool from bicycle shop.
Pair of tyre levers (some like to have 3, I use 2, some use 1 and a screwdriver!) - Definitely two, get passenger car size 12 - 14"long
Bull nose pliers (with wire cutter jaws)
small triangular file
Feeler gauges (p
Hacksaw blade - or part of it. - No, hacksaw can be found & borrowed everywhere.
Valve adjusting tool. Small enough to carry. You can possibly skip it and use long nose pliers.
Small vice grips
Tyre Pump
DMM (digital multi-meter)(small - with a 10 Amp range... leads are failure points)
Soldering iron - No
Jumper cables (if you have a electric start only bike)