Regarding reciprocal arrangements within Royal Clubs, most are very accommodating. Royal Colwood in Victoria has formalized reciprocals with 43 Royals. These include all the Canadian and Australian Royals, 1 in NZ, 3 in Asia and many in the UK, including Royal Dornoch, West Norfolk and Cinque Ports.
Each of the clubs differ in the number of these relationships they have, some have enthusiastically reached out to all the other Royals, like we have, others are less involved.
The only Royals that tend to not enter these relationships are those on the Open rota, they would be swamped by visitors, although some of them will informally offer Guest of Member rates to visitors from overseas Royal club members.
Being part of this Royal family of clubs is something every club cherishes. It is a very nice part of belonging to one them.