So its kind of backwards, but I would try an Albright making the loop section with the .55 mono.
Perhaps use some HMP hollow core (its new) in 150/200lb as your leader and insert the mono into the braid for a knotless join?
Since its an experimental set up, I would think to keep the length of .55 mono to around 75-100m - just enough to give you the stretch you need to slide.
Anyone else?