Native Grid support is coming The 2.1 firmware discussion on the lines forum is really exciting.
It’s a module that keeps on getting better and better. During NAMM, Intellijel mentioned potential Teletype support for the Tetrapad. I haven’t heard anything about that since.
But yes, just to reiterate @Geremy’s point: all you need is a TT. The keyboard is used for programming it, but isn’t actually needed for performance. You can use the front panel knob and button to change the currently active “Scene”, which is a collection of eight triggered scripts, an initialization script, and a metronome (auto-triggered) script. You can use the keyboard to manually trigger scripts, so it certainly can be used for performance.