I am going to at least double stack.

The 1st filter will be the solar film - 1st attempt - with the Ha after it. 2nd attempt will be the 10x nd filter with the HA after it. I will absolutely test the the 2nd attempt w/ a non camera rig - basically a large magnifying glass projecting to a board of some sort with temps being measured from ambient. Much of a step up in temp is a no go.

The higher reputation youtube folks pointed out that about 40% of the light from the sun - getting through the atmosphere/ozone layer - is IR we can't see, 50% visible and 10% UV. Excluding IR/Visible make UV exposure values drop.

I totally get that the visible/uv cut filters likley allow a very broad IR light stream in which might be too diffused in its origin to create any texture in the sun surface - we will find out when the filters arrive.