I bought AKA adapters for my SC10. I don't race it, so didn't bother me about not being able to use them at a Race Meeting. SC10's are for letting off steam
Not sure about the size worries of 'off-road'. 1/8th Rally X wheel/tyre combo is as close as dammit the same as SC size.
By a set of adapters and have some fun. Especially as you can pick 1/8th Rally X sets slightly used for around £10
P.S. I had to get mine from the USA, think it was A-Main