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Some points to bear in mind:
1. Do a linearity test BEFORE doing anything else. Do this for the channel that you will be measuring (try it for R and B as well). R may be better. AGB cameras do have some linearity. It just a matter of finding out what that 'exposure' band is.
2. I assume your UV/IR filter is a blocker in those bands rather than allow only those bands.
3. There is nothing wrong with stacking images for photometric use, just make sure you Dark, Flat and Bias correct them first.
4. G is only very loosly like V. G is a much broader band with 'leaks' than V. In fact you way wish to convert your RGB layers into mono and stack them as a single mono to replicate a "Clear" filter to give you better signal strength.
5. Precision is about SNR and linearity. If you are not calibrating with flats, darks and bias then can only achieve +/- 0.5 mag at best (no matter what your curves say) due to low SNR.
6. Your on the right track and there is nothing stopping you doing precision differential photometry with a DSLR if you know your systems behaviour and stay within it's boundaries.
If you want addictive, start working an eclipsing binary star and plotting your results. You'll get a usable period plot after observing it continuously for 4-8hrs.
Cheers
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