Perhaps, but I don't wanna be in the same room with it.
Strobing occurs occasionally with lathes lit by fluro strip lighting - we go to great lengths to get rid of it, not do the opposite.
I don't think I'd go as low as a 15t gear for it - your best bet would probably be to try and work a 20/40 pair in. Or even a 19/38.
In fact the 19/38 might work out very close in 40 dp
Frankly, if the bore is good, other than the blowhole, I would be inclined to ignore it, especially if fitted with CI rings, even with soft packing you will get away with it more often than not.
It is better to avoid mixed marriages, yes, BUT in this instance 4BA works out just right, and they they are easily available.
Besides which, BA (British Association) are a metric based bolt in any case.