Original is also very easy to modifie, as its aluminium and good welder can weld easily also aluminium if he have suitable welding machine. Need only more lenght. Surely need also suitable aluminium "bar" to add lenght, but its very simple to make with lathe... Near all metal companies can do such work very easily/fastly...
I would also put little bigger plate to lower end, as sometimes have put bike to soft surface(like very hot asphalt,etc..) Ok, sometimes i use strong aluminium plate under side stand, or if i have beer can, i drink it and make it very flat with me boots and then its 100% perfect under side stand in sand, etc....
Surely everybody can do whatever to they bikes and i accept also such...