It's a lot of work, even if we would use 1066 as a basis. A First Crusade scenario would be in 1099 or 1100, so you're dealing with a 33 year gap. Many characters will not have been born yet...
The only new scenarios I know of are Andron's Fourth Crusade / 1204 scenario (based on the 1187 one), and Veldmaarschalk's two 1066 variants (based on 1066 Hastings).
I'm interested sure, (at least right now) don't have the time to invest in it