I have supermoto wheels on my sm 610 ie,an i have cross wheels as well.The problem is that te sm caliper is not ok for the other one. Do you now from what other moto will fit to mine? the original lokks like this:
On the 610 to go from SM to TE/TC all you should need to do is remove the caliper bracket and do a little shimming, and mess with the axle spacers. But you said the caliper is no good for it, so I reckon you'll have to get a TE/TC caliper.
Does your 320mm Brembo not fit ? Mine does and I converted from SM to TE. I think some people have mentioned they took a little bit of metal off the back of the caliper as it can be a tight fit. I have noticed a bit of clearance issues on the rear wheel rubbing against the rubber mud flap, Mine has a hole in it now And there is a little bit of wear on the offside fork protector (clutch plate side) Only noticed that this weekend when I swapped it back over to my SM wheels so will check what the cause is there.