Thanks - definitely important considerations. Still finalizing my plans with simplicity and ~low maintenance paramount.
Evaluating the merit of a roller filter (e.g., no more socks, keeps the sump clean, crystal-clear water, etc.). I would likely run a bean animal overflow with about ~70% of the water flowing through the roller and the remaining water feeding the refugium. As the refugium largely uses small molecules (e.g., nitrates, phosphates, amino acids) that aren't filtered out by the roller in full, this should, in theory, work well.
We will see!
I don't use a roller filter.
I go to a local craft store and purchase 12"x12" WHITE felt squares (as white doesn't have any coloring dye). I get a package of 36 for $9.99 and I swap them out weekly with my water change. Although, it is usually clogged by the 4th or 5th day. When that happens, I pull it out and put a fresh one in on the next water change.
I think you have some good ideas if simplicity and low maintenance is your goal.