A few things.
If anyone did a bit of research into this motor, you would find that the crank and rod is a weak point once you run oversize pistons. So it might be a good this to stop trying to repair the stock crank and rod.
Besides, each time you split a crank small alignment problems creep in and you can also affect the cranks balance. Also, how much does it cost to split the crank and install a full set of bearings and a new rod? Now I am not talking about some guy using a few backyard tools to do this and reusing some of the parts he thinks are still good. I am talking about having it done professionally and rebalancing the crank and replace all the bearings in one go. By the time you have done this, with a new rod, full set of bearings and so forth, you might as well spend a bit extra and get yourself a fully assembled aftermarket crank. Most of the aftermarket cranks are reinforced and able to handle the big bore kits much better than the stock setup would.
Guys this is engine upgrade 101 stuff. If you increase engine size you need to ensure that the crank and rod can handle it.
Another thing. ProX " cheapies "
There is one major factory that manufactures most of the top Japanese name bike pistons. This factory manufacture more than just what the factories orders and the excess pistons that are left goes into a box with a different name on it.... ProX. So in fact, you get OEM quality, if not the exact same thing you would get from your Suzuki dealer, but at a cheaper price.
Then yes, I agree with Wrench and I know what he is implying. When I also talked about this “belief” some have in other topics my head was bitten off, so now it's a matter of, "if they don’t want to listen, they must feel".