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Jeff
While I would agree that theoretically it should be possible to generate synthetic BVRI filter output I doubt the exercise is worth the effort ... a lot of calibration and adjustments vs photometric star and filter standards would be needed. Leaving cost aside (a set of 1.25" BVRI filters isn't that expensive) doing photometry is a lot easier than spectroscopy (at least when compared to the slit type). I strongly believe the small filter investment is well worth it and your data will be a lot more acceptable (level of confidence in the results) if/when submitted to, say, the AAVSO.
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