tl;dr: Dedicated TOTP hardware recommendations anyone?

I'd like to use TOTP-based 2FA for some services that don't support FIDO tokens.

For some time I did this with TOTP applications on another device (laptop or fallback smartphone in the drawer), but found it cumbersome to boot up and shut down an entire OS for every 2FA login.

Therefore, I'd love to get a dedicated TOTP hardware thingy, and am looking for pointers/recommendations! Which one(s) should I look at and why?