All the arm-balance poses and handstanding are dependent on grip strength, at least to do properly. Maybe I'm conflating finger/forearm/wrist strength with "grip", but they sure feel related. The crow pose and handstanding seem to help my DL, and visa versa.
Really many forward standing poses offer opportunity to use the mat as resistance (even downward-facing dog). Probably want to look into this with an instructor as there are techniques to improve resistance while limiting tendon strain.
Basic grip exercises like balling & extending fists can be easily worked into practice as well, perhaps while focusing on the feet in a toe squat.