You'll waste the whole meeting fiddling with the technology and getting used to the UI.
I'm old and retired and far past meeting age (thank god). But my take is.
You'll not only waste the first meeting. Probably much of the first six meetings. And significant chunks of later meetings. And probably you'll need to spend time training any new participants in later meetings.
And ... you probably want computers with real keyboards so people can type notes and make corrections and not have to worry about spurious touches doing stupid things.
I've never encountered any sort of computer drawing tool that wasn't excrutiatingly painful when compared to paper and something pencil-like. Doesn't mean one or more don't exist. But usability for graphics in a free wheeling environment really is something you should consider.
Not that what the poster wants isn't desirable. But what is really wanted is probably a process that can be "imported" and adopted to local needs, not a technology you can order 8 of from your hardware monger. In particular one should view any off-the-shelf commercial solution with the same attitude you'd take toward a large dog who is growling at you and foaming a bit around the mouth.
Would salesmen lie to you? You betcha. It is what salesmen do.