I've seen the Problem Solvers version as well, but I've also seen some very negative reviews about its durability and ability to actually hold the cables, so - cheap or expensive that one was off the table. I like to keep the one brake I have functional...
Not sure if bicycle rated as it's really an industrial/wheelchair product, but https://www.berghspecialproducts.nl/rolstoel-onderdelen/remkabels-en-kabelsplitters/kabelsplitters/type-adr/A.KABSP.ADR201
TBH, I always thought Jtek was the cheap option give that it's already significantly less than the Problem Solvers one.