Mike,I don't think this is dragging this far off topic really, as the discussion has developed into foreign bodies setting up in other territories, which was certainly on my mind when I started the topic.
Royal Order of Scotland and St Thomas of Acon are both bodies administered from one jurisdiction that operate on others "turf", as does Athelstan I think.
And don't forget that R&SM, Rose Croix and others were imported from abroad originally, before becoming sovereign orders in their own right.
I assume that as long as the relevant Grand Lodge does not
a - already control a version of the order or
b- object to it on fundamental grounds (eg the order not requiring a belief in a supreme being)
then the "foreign" order is allowed to operate/tolerated.
And if not, the the home Grand Lodge bans its members from joining.