Thats it! Vicky bhai you have nailed it dead on. This is the best route and probably the cheapest too if somebody wants new stuff.
Bro, like I've told you earlier that a disk brake setup should not cost any more than 10k and there are solutions out there which can solve your problem for even less than 10K but I guess you are hell bent on spending 20k. lols! anyways, its your money, you may do whatever tickles your fancy.
Bro, like you said, a really smart person should acquire a GN250 and salvage all the original Japanese parts for their use.