You could put together a simple enough system - connecting punch (jab basically) 1pt, connecting combination (double jab, 'soft' 1-2) 2pt, CP with power (hook, unprotected jab, uppercut) 3 pts, CC with power four points(classic forceful combo).
5 judges, 4 buttons each, an attack scores the highest value 3 of the judges agree on instantaneously -so if the 5 judges split with 2 claiming a combo, no force, 1 thinks 1 punch had force but not combo, and 2 thought it was a combo with force - that's 2pt, 2pt, 3 pt, 4pt 4pt - which means three judges gave at least three points - so 3 points scored. If a mandatory 8 count grants oddly enough 8pts, snf of vourse a KO/TKO ends the contest immediately, there's your system. Score cumulatively, or over three round by round scores (I prefer cumulative, round by round leads to a lot of dead rubber thirds rounds). Obviously punches defended with arms and gloves aren't going to score at all, so in effect sound defence is well rewarded. Eventually you could look at similar pressure sensors in the gloves as TKD has, but that's not a necessity right now.
If you think successfuly inflicted power should be better rewarded, make those numbers 4 and 6, and a standing count 10 rather than 3 and 4. If you think pure technique more important put everything up one to 2,3,4,5, as this will make a successful jap worth 40% a hard combo, rather than 25%. Fiddle and trial until you are happy
Remember TKD fiddled with its scoring a lot to start with, introduced rounds, incentivised and then disincentivised roundhouse kicks - there's no harm in messing with the rules a bit - the key, maybe, is to get away from the assumption that Olympic boxing is just a training ground for the prize fighting pros of the future, so should basically look like prizefighting. That' need not be true..