If the filters come off I guess you can try scanning them directly and see the result, if it doesn't look good some different technique could be used.
Would be nice if you could scan the carts, but I guess I should extend that request to Sean since he should have quite a few of your R-Zone games in his possession now smile

Thanks for the link hap, I wasn't aware of that modified version of Paul Robson's emulator it looks nice even though I'd rather not have the actual console showing at the left side.