RE:Epoxy Butt Splice
The scenario you mention has little (or no) similarity to the epoxy splice but I know what you mean... store-bought loops suck!
There's no way you could hold them on the line with a drop of zap-a-gap, it would take a minimum of a nail knot with some aquaseal over that once again. I used them once, only once. I build my own loops for hybrid lines. The problem with store loops is that any opposite pressure undoes the Chinese finger grip! A guide hitting the non-loop end will do it every time.