WR250R wheel and brake upgrade question

I would like to purchase warp9 wheels with the 320mm brake rotor but I would also like to be able to switch back to the OEM R wheels.  I understand that going with warp9 wheels I will need a caliper relocation bracket.  Can I buy a 320mm rotor for my OEM R wheel so the swap is super easy?  Looking over the EBC catalog they do not list any 320mm rotors but they do for the X.  Can I just buy the 320mm EBC X rotor? Sorry I miss read the catalog EBC does not list a 320mm rotor.

Well I suck. I came across this post and I think I have a better idea. https://wr250rforum.forumotion.com/t2727-wrr-converted-into-supermoto