In my view there are two aspects to this we should be considering:
a) does the proposed activity have a clearly defined observing programme and what are its goals and timescales?
b) where are the skills and experience most likely to be found to pursue that programme and achieve these goals?
At the moment, the answer to the second question is probably within the Variable Star Section. These observers are used to measuring the faint, low amplitude signals required, using a range of filters and processing the data. It would therefore seem logical to consider launching the new activity within that body of observers and attempting to build a sufficient level of interest and activity that the goals can be seen to be achievable and the timescales realistic. Once a firm base of activity has been established, useful results are being achieved and a long term programme looks viable, then is the time to consider forming a new section or group within the BAA.
Regards,
David