My impression of the issue is that you find chording problematic, but OneShot is too slow and/or awkward. I can suggest one tool that you may not have tried yet: Qukeys.
Qukeys makes it possible for many people to use home row keys as DualUse/ModTap keys without unintended keycodes, and — depending on chording habits — without significantly slowing down. Chording keys with fingertips on one row can be much more comfortable than using the palm and thumb keys, especially when using more than one at a time.
Qukeys does a much better job of this than QMK’s MT/LT keys (rollover doesn’t result in unintended modifiers, in general, and it doesn’t require the user to slow down). It may not be a solution for you, of course, but it’s one more tool you could try.