Sadly, it seems there is no real solution!
Allowing PC to turn off cross play does not stop controllers - a large percentage of PC's now use controllers (as a response to aim assist in games) so they get aim assist. I'm not going to take up a controller (it's not my thing) and as for the geniuses who said "if you're not good......" That is entirely beside the point (oh and on a level playing ground I'm ok).
The only solution is not to have cross play for any one but EA will never do that..... It would take far more courage than EA has!
The result.....K & M players will stop playing (as a lot of high profile players already have) - now EA does not care about this cos there are so few of us left.