Threading of motorcycle Spokes?

Hi Dwgs

Seek assistance re info of “wheel repairer” who can thread motorcycle spokes (Gauteng area)?
I want to replace spokes on ‘17 front wheel of ’74- TS50 Suzi that I’m restoring,  but can only get spoke’s of longer length,  thus will require cutting to length & re-threading of spoke shaft (to mate with threads of the supplied nipples), unfortunately these threads are “rolled on” to the spoke shaft (not cut with conventional Die).

Thanks in advance