This is the entire basis of Raven's combo looping. End a combo with f22u1 gives a free cross-up attempt. You can also end combos with f2~db2 which places them slightly closer meaning there's a better chance of reversing their wake-up inputs. ji2 usually wiffs though, but ji3 will hit (which can also be linked into a full combo, via ji3, d1~db2).
Unlike Wonderchef's example, these aren't safe because you can block a wake-up, they're safe because you're right above the opponent's head so virtually all wake-ups will wiff (which also generally gives you a full combo punish). Unless you have a good AA or over-your-head (different from overhead!) wake-up, your choice is block correctly or eat another 44-45% combo.
Against some slow but invincible wake-up attacks (Black Adam's area lightning one springs to mind) you can still land and block in time. Oh, and there's also an option select vs. Scorpion that makes this 100% against all of his wake-up options (MB teleport will still leave him +9 or whatever it is), with anything other than MB teleport and super being full combo punished
Failing that, a longer range db2 combo ender (or df2) gives the exact situation described by Wonderchef as you're at enough + frames after the db2 to jump, kick and land (and thus block) before most wake-ups become active.
edit: also, f22u1, df2 and db2 are all hard knock-downs so no rolling out of the setups
