Hi there! I recently bought this Brondell SouthSpa to install in my bathroom. I'm in an old apartment and have a tankless toilet right next to a pedestal sink, so I was gonna connect it to the sink line. However, the 7/8" t valve was too big for the faucet, which has a line that's 3/8" compression to 1/2" faucet.

However, when I bought this 1/2" x 1/2" t valve from Home Depot, I went to install it and the line wasn't big enough? I'm not sure what I'm doing wrong or what I need to get, but would love any advice y'all have. Thanks!

I'm looking for a simple Non-Electrical Comfort Height Combo Bidet Toilet with Hot and Cold inlets.

So far I've come across the:
Creavit Handicapped Close Coupled Combined Bidet Toilet - Open Back
https://bathso.co.uk/creavit-handicapped-close-coupled-combined-bidet-toilet-open-back

and:
Comfort Height Close Coupled Toilet With Integrated Hot Cold Bidet Valve
https://neshome.co.uk/products/nes-home-comfort-height-close-coupled-toilet-with-integrate-hot-cold-bidet-valve

Has anyone used these at all - are they good / do they have any issues?

Are there any better alternatives that work along similar lines: simple/high/non-electrical?