Get a 36 spoke rear wheel.. Bring Funds If It fails you buy a replacement wheel ..

a Cassette hub Mid price will be fine.. If the rim fails , In The LBS, here, on a popular tour route

we cut a fancy hub out for you to mail home , Or you spend a week end or longer
in a Motel and eat and drink with the locals and other tourists for a Rim and Spokes to be ordered, and the wheel rebuilt.

If you do get a 40 spoke rear , get a 40 spoke front Too, that will be the spare Rim source..
when you damage the rear rim, then you buy a More common front wheel..