There are some great 0% options on the tour, even craft beer of 0% acholl, wine can be an option also. So yes you can join for sure!
Yes, some areas have stairs, but it’s possible to go around them and visit the sites by wheelchair acces. We must admit, however, that the small stone roads are not the most comfortable for people in wheelchairs. Also the enterance could be difficult but if there is a will it possible!