Hi Richard,
Thank you for your comment.
Yep, 0.005mag dip is VERY shallow, almost negligible... less than 1/20 of what I think I managed to detect in the past.
However, since the only short term & relative measurement is involved, maybe it could be achievable...
Proxima is visible through the whole night in this part of the year, so... maybe ...
if Proxima b is transiting at all.