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Yes you can do it. There are a number of papers about using the green channel as a defacto "V" filter but I'm on holidays and don't have the links with me.
One rule though is it is preferable not to stack images and you must not perform any sort of stretches etc on the image.
You can median stack or average images but it is preferable to measure the flux on the individual images and average the results.
It is very easy to get the "V" fluxes from the AAVSO charts and try some measurements.
Good luck.
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