Reddit reviews Brondell Hot/Cold Bidet Mixing Valve Upgrade Kit
We found 3 Reddit comments about Brondell Hot/Cold Bidet Mixing Valve Upgrade Kit. Here are the top ones, ranked by their Reddit score.
Solid metal ergonomic HOT/COLD adjustable temperature bidet mixing valveWater pressure control for spray adjustabilityBrass core valve with water shutoff (advanced safety)Includes braided metal hot water connection hose (78 in length, standard 3/8 connection)All accessories included for standard installation (Hand Bidet sold separately)
this can solve all your cold bidet problems: https://www.amazon.com/gp/product/B00DOJP310/
Most of the shower mixing/thermostatic valves regulate down to 100F. Too warm for your application. I think this one will work down to around 70F:
https://www.amazon.com/Brondell-Bidet-Mixing-Valve-Upgrade/dp/B00DOJP310
I think you'd need something like this.
Notice in the bottom product pic it goes directly from the hot water into the valve and then splits off from there.
You may not need a valve that mixes, but you need one that accepts the hose inlet and then splits off to your required bidet and sink hoses. /r/plumbing can probably link a specific part.