If you’re that afriad of it, just block and reversal backdash whatever ender he uses for a free neutral reset. F4 has short range.
And the funny thing is that those options are all unsafe as I said. Just block low and wait. You’ve got so many fucking choices here. Standing 1 full combo, beats u3, loses to everything else. D3 to beat u3 or parry, lose to fireball which resets neutral and you’re out with small dmg. Block and wait, loses to u3 (but you have options after blocking an u3) but wins vs the 3 other options you mention because they’re all launch punishable.
How many options do you have vs Sub Zero?
Oh, right. Just the 2.
Liu also has f4 staggers and shaolin stance, but I don’t know why I need to do the counterplay work for casuals who are too lazy to do it themselves. If Liu Kang is so easy, go win a major tournament with him. You’ll literally be the first to do so.