Importing a project from Sibelius advices

Hello everyone,
I’m going to export in xml all of my project from Sibelius to notate them in Dorico. There are a few that I am particularly fond of and would like to prioritize. Problem is that these pieces have Aleatoric boxes and changes in staffline. I know Dorico cannot do these things natively yet, but I would like to know if there are some preparatory steps I can do in order to make my fixing work easier, since I’m not confident with xml conversions.

Any advices? Thank you.