I'm not a filter expert by a long shot, but I'll give it a stab
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I don't see why you couldn't use what ever filters you want to use Ric. Many imagers use Astronomik LRGB filter. I don't know, but I would bet they are better quality and transmittance than the standard meade ones. Do you have a chart showing the meade transmittance?
Baader produce a pretty good UV/IR filter.
What you may want to look at is getting a manual filter wheel that takes 1.25" filters, and use that instead of the straight meade one that leaves the filters open to get dewed up/ dusty or damaged.