Well if you are not going for achievements and don't have to play on ironman as the prospect of cheating is too strong, then you could use
the console (cheat) or a mod to get rid of infamy/Threat/coalitions.
If...
Ahh, well, I only play Ironman, mainly as it stops me from cheating if get frustrated and it has the bonus of achievements. Although I could play without ironman, the temptation is almost far too great.
You can still get crusades back, it just takes a little effort. After you mend the schism Catholicism and Fraticellism become heresies of Orthodoxy. Convert to one of them (for example, by moving capitals to Rome) and vassalize whichever pope you want, and you'll be able to call for specific crusades.
Well Rome is my capital now, and its orthodox and even become greek culture, but with such low moral authority, catholicism is breaking out everywhere, so I might still be able to get it
Before Conclave it used to be so much simpler to grab the SPQR achievement (I never got it due to an update which corrupted my save file), and I hope that they will tweak threat in an upcoming update. Which brings my to my next point: when the *secret dlc* is released, which as they said will be a minor one (but still a must-have for every fan like me), will this dlc corrupt my amazing navarra empressive game or will it just change it a little. Because with different dlc releases I've had both experiences...
Here's hoping for secret bears