It's the anything that'll fit in frame storage that's any good? Or are they all so small at that point that it's an infuriating pos.
In my case it's a 2023 trek top fuel. in thinking about local rides where I could happily ditch carrying anything.
I've got a Lezyne Pocket Drive HV. It's OK. It does have a tendency to unscrew valve cores.
One thing I've found with keeping a pump inside my frame is that it's a real faff to get to it when I need it. It's one thing that I'd prefer to have on an external bracket.
CYPLUS on Amazon? Matchbox sized electric mini-compressor.
Looks to be pretty well reviewed. Would probably get enough air in for a top up or to inflate a tube if you slashed a sidewall.
looks like it could be a tight fit or the width, but there are other electric options that might squeeze in there as an emergency local option