I've been trying to get a lot better at comping and improvising, and one of the things I put together to help was this tool that lets you toggle on certain chords (I,IV,V, etc) in given keys and get color-coded fretboard maps for all the inversions. There's also the ability to add "shadow realm" chords (parallel key) for spicy non-diatonic flavors. I usually practice using this to just throw up a random progression and try to bang something out up and down the neck, as well as doing things like running through cycle of 4ths to hit a bunch of different keys and inversions.
Hopefully some folks here will find it helpful!