Which Yubi Key do I need to install Heads on

Which Yubi Key do I need to install Heads onto a Lenovo X-230.

I see the Librem Key for $59.00.

I know there are several Nitro Keys.

For the time being, could I use an ordinary USB Flash Drive? Just I could go ahead and Flash Heads onto the Lenvo x-230, without an encrypted drive, either a ordinary Flash Drive, or nothing?

After I install Heads onto computer, can I change the SSD in X-230 to another Linux OS? Would it start?

Which one of the Yubi Keys can be used to store Passwords as well. Any recommendation as to which one? And