That's pretty interesting. I use Ventoy pretty regularly, had no idea it was based on tcl!
Wrt kubernetes, as far as I know (and I am a tcl "noob") there is no built-in or simple method of doing so. It's a case of meeting the dependencies and building from source I would guess.
If that sounds complicated, I believe the standard response here is something along the lines of "That's not the tinycore way".
Which makes sense in a distribution which aims to maintain an incredibly lightweight footprint - but I understand is not too helpful to you.