Canvas covered is acceptable. The goal of Elite was never to be 100% movie accurate but instead to clarify, refine, and elevate many of the details that are not in the 501st requirements, with requirements that are readily achievable (IMHO we're easier and cheaper to get than MEPD Police Officer or Lancer status). At the we thought canvas covered would be fine as it may be an easier upgrade for all the FX folks, never realizing that everyone until now just opts to get a canvas belt from the start.
Actually I think a canvas covered belt is fine - the argument isn't against the belt but how it's rigged, but I can see how since everyone else has just opted for canvas in the past there may be a need to remove the "canvas covered" (though it will not affect your application).
I can understand the frustration with the belt but looking at the past 47 submissions this is a comparatively minor nit. Also, given the number of UKG folks on this board I'm sure someone can procure you and forward on an SDS belt if needed, though as mentioned getting one from TE2 or AP would be fine as well.
You're so close brother! Just that and the blaster and you are golden.