I would definitely go for a clematis viticella, not a dark colour, one of the whites would look good, so natural, exactly as they grow in the wild.
Today in sunny Lancashire.
Seen here in a local garden, Jan Fopma is almost 8 ft. tall.
Jan Fopma is a super plant, unusual flower, described as having chocolate scent. Good luck with that.
A seedling from integrifolia rosea.......
The pink form of integrifolia, rosea, is a good pink. Here in our border in Summer
Lilac Wine.........Elkie Brooks.