Have a look on the DA site and look for climbing roses that are suitable for arches and obelisks. These should be pliable enough tto train when the canes are young. Narrow down by size, colour, health, bloom type and flowering habit. Roses listed for walls and house fronts tend to grow straight up and be less bendy, though this is not always true.
The DA filter function does miss out quite a few of their catalogue, but it might give you a sense of the choices. If you have a colour choice in mind to start, this will help with the decision.
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