My condolences as well, friend.
Fortunately the one that takes their collar off likes to be around us, just naked. The other ones keep their collars on for the most part. I attached Tile Stickers using the Airtag holders.
Unfortunately I’ve already tried the load cell setup, the cats actually avoided it. they didn’t like standing on the platform with it, so I wasn’t able to do it based on cat weight, and trying to do it the other way around is nearly impossible, IDK if you’ve played with those sensors yet, but they have so much drift it is rediculous. They’re great for a quick measurement after an initial intentional tare, but after that, nope. Had to take them off my bed for the same reason. Right now I have a board with 4 load sensors mounted to it that IDK what to do with. Was gonna maybe try to use it to track when I need to refill my water dispenser. - besides the point.
I think I’ll just keep the two sensors for now. Maybe the BLE tracking on ESPHome will evolve a little more, who knows. Honestly, the other chip costs what, $3.50USD?
I’m gonna have to look into Groocy and see what you’re talking about on that one.
Edit: quick search for Groocy didn’t get me any good results. You got a link?