PS360+, the jst expansion harness and RJ-45 cable ends- Questions!

Hey all, I recently picked up my 2nd set of PS360+ PCBs and I decided to spring for the JST Expansion harnesses to save some space in the box I’m putting them in. One thing I realized is that the cables that are used are quite a bit too big for any RJ-45 connectors I know of… is there any around this? The wire gauge is between 26-20 gauge.

I’m not beyond stripping the wire and soldering it to a pre crimped RJ-45 cable end, although I would like to avoid that.