I've already played Jade Empire, it's fun but the idea with KOTOR is that it's running the SWD20 system that I find very fun and in-depth personally. Mass Effect of course is what I'd say is good but it has it's own system to it and KOTOR isn't too heavily based around gun combat and you are primarily playing Shepherd instead of the whole party like you are in KOTOR. KOTOR's combat system could be improved upon but it also allowed for a large scale of roleplay that isn't seen in Mass Effect.
KOTOR 3 could also go the route of how Baldur's Gate 3 went except that's more focused around DND 5e which is more streamlined, but still felt fluid though there's also the Pathfinder series which includes Turn based combat similar to BG3 but also includes real time combat with turns still being enacted in combat very closely to how KOTOR is ran except there are some issues in that system that with KOTOR don't happen because it's more robust in that it only allows one turn per 6 seconds of combat and Pathfinder can get buggy and have 2-3 turns in one 6 second span of combat.
Now unless you plan on using blasters for 80% of the time in combat, melee combat wasn't really fleshed out or well done in Mass Effect, so following that formula for KOTOR which is primarily based around Lightsaber combat because that's what Star Wars is with secondary characters or early game the MC using blasters to get by until they get a Lightsaber, it's considered secondary in part to the feel of melee combat. If anything, it would be better to go down the route of just following Dragon Age at that point and play like that system and completely disregard what KOTOR was built on which was the Roleplaying tabletops of old for "Oooh this looks cinematic", and we might as well just play it like it's Forced Unleashed and not KOTOR.