I just looked thru the 2015 (new one not out yet?) rule book and per supersport rules you can replace fork internals and shock.
RC are you sponsored by Spears?I race with CMRA, did a couple ULWGP races on the R3 last year and plan on racing that class all of 2016. The 2016 rule book is a work in progress but I think it can be downloaded under the forms sections of their website now.
They allow and will continue to allow fork internal upgrades.