I use my iPhone 8 paired to my Kickr Snap while also Bluetooth listening to podcasts/music or watching YouTube videos. No HR or cadence. I may be missing out on some features, but it’s all I’ve done since I started in January, so I don’t know. I do wish I could see videos and the workout at the same time, but I’m usually just listening to something, so it’s not a big deal. When I started, I was worried I was going to have to use a computer and deal with that every time, but it’s been fine!
Those should all work as I’m doing the same currently - just an iPhone that runs TR and my music. Bluetooth hrm and cadence sensor paired to the phone (and TR app) when not using my power pedals. Have visibility into all the stats.