Does such a hardware wallet exist?
No, and it would be stupid for someone to even think about doing something like this.
Something similar could be done with importing seed words generated online in unsafe way, but I would never suggest stuff like this to any sane person.
I just want to move funds from software wallet (on PC which is always offline) without going online (if possible). So this option with importing several single private keys would be safer than the option with sending transaction.
No need to overcomplicate things so much...
Just move the damn coins from your old address to new one that is safely generated offline, and you are done.
That is if you want to be more secure, but you can do whatever you want if you like being unsecure.