I bowl with my middle and pointer, and I do fine. it's not like your cheating when you bowl like that, so if your good bowling with your middle and pointer keep bowling like that.
The moment an umpire feels that the bowling of wides is deliberate he can summon the captain & warn him. If it still continues I feel the bowling team could be scratched off & penalised further ( However this point may need further confirmation)
Most bowling alleys have a pro that works there. Talk to the pro and see if they offer lessons.