It sounds like it potentially can work from my limited prospective but bearing in mind what Moe has said, there is a risk.
I'm not into bichirs, nor plecos, so I didn't know. My experience with these two kinds of fish is very small. IME, bichirs are indeed so slow and indifferent that I imagine a zealous pleco might suck on their slime. IDK how widespread this danger is. Some synodontis catfish like eupterus have been reported to do this too to their tankmates but it seems it happens rather rarely, like 1 in a 1000 to any significant degree. Yet indeed my 8" eupterus killed my 28" iridescent shark catfish by doing this.