Let's limit to 9 & 10, since 11 isn't built yet.
(Or, I guess it would be easiest to have 11 visit anywhere, since it only consists of a headlight, number plate, bell, and a couple of wheels.)
Since MNG is under FRA jurisdiction, operating 9 or 10 there would require a FRA waiver. If we cross 218, we'll upgrade 9 and 10 to FRA specifications.
Operating either at SR&RL would be more feasible, since they are insular. All it would take is dedicated interest and money to make that happen. (Both easier said than done.)