You are limited to 18" or larger, which drastically reduces options for off road rally wheels. The Sparco Terra and Sparco Gravel are the only options I have found that has a dirt rally style and fits these cars.
You are also limited in what will clear the wheel wells. I have found 235/50 R18 to work without issue, and you
might be able to squeeze a 235/55 or similar, but cannot verify that you will be able to without rubbing.
For reference, here is my 2021 V60 CC with 18in Borbet Type Y rims with 45mm offset and Continental ExtremeContact DWS06+ in 235/50 R18.
Bumping up to a 235/55 R18 would increase the radius by about a half inch. There
might be room in the wheel wells, but it would be
very tight.
Unfortunately, there are no real lift options for these cars that I have been able to find, other than the Spaccer stacked spacer system, which could get you a bit more than 1in of extra clearance. However, that would do nothing regarding clearance in the front or rear of the wheel wells, which is already tight with the 235/50's.
Likely the best you can do is 18in rims with 235/50's, which limits you to pretty much the two Sparco options above and a set of Falken Wildpeak tires. If you do try and fit a set of taller tires, please let me know how it goes. I may try this spring myself as well or may just go with the Falken's.