Based on all the information, I think that glass is the option I'll choose.
I like the first image with the Seymour Solar glass filter, and they have in stock.
My refractor is 6 inches, but with the dew shield is 8 inches. I can remove the shield, but I'd rather to keep it. Is there any problem?
I can think of a few things to consider.
The larger diameter filter is going to cost you more and remember you have to buy a filter slightly larger that the outside diameter of the front of your optics.
One of the cons of glass is they weigh more so they change the balance of your scope and mounts. The further out you have the glass filter the more mechanical advantage it is going to have tugging down on the front of your scope.
You need to be able to reach the filter easily to remove it at C2 and replace it at C3 without jarring your gear, and the further out it is the more leverage it will have on your mount as you touch it.
I don't have a real reason for this, but I just think it would be better closer to the optics, there sometimes is an issue with needing to slant your filter a couple of degrees to prevent ghosting of images from the partial phases. But that depends on how long your dew shield is. Mine is short.
It depends on whether or not your front objective has any protection at all with the dew filter off. I need to leave the dew shield on my Takahashi because otherwise the front objective could be rubbed on easily. There is no leading edge to the optical tube at all.