I carry a LCP Max in my cowboy boots, but would love to stuff a micro dagger in there if it will fit. Anyone here have one they can stuff in the top of a boot and post a pic? My concern is that the grip will be too long and not fit all the way in the boot.

it would be held on to the boot upper with a clip draw affixed to the slide.  Also, are there any plans to make a Micro with the frame size of the G43?

I would say there is zero chance of that.  G43 are already cheap enough.  I bought two PD trade ins for $309 each with three magazines.  

I don’t have a micro dagger, but here is a pic of a 43X