My scenario is the same. e.i. where i had the original PAIOHC at start of campaign and then switched it to this (PAIOHCC). But i could load in to the save and walk around for abit before i get the crash.
HOWEVER this is super ODD! now when i downloaded
Save Missing Module Fix - Fixed and tested it with
continued mod (PAIOHCC) i didnt get any messages like you mentioned,
still got the CTD. I Then tested reverted back to the old PAIOHC and see what happens,
then i got the message "this mod might cause some issue etcetc" and after that i got "found duplicate party: Baroness Shusanna Party ..." twice actually(??) which in turn solved the instant CTD! WOW!!
After that i reverted back yet again to PAIOHCC (latest version of this mod) and it actually appeared with baroness. I get no CTD now either.