Just my thoughts:
There could be a problem keeping the hydrangea trimmed to shape. Climbing hydrangeas are aggressive growers, once established. My climbing hydrangea blooms only on old wood so if I pruned it, except right after it blooms and before setting buds for next year, I would have only foliage, no blooms. If that is all you want....little or no blooms.....it might work.

Thanks for your reply, I really waant it to bloom, and I 'm not sure what shape I want. Just started getting interested in topiary's. Made some with ivy in the bottom of the pot and planted sreppables in moss on the top. I'll see how these turn out. I get too many ideas, now I need to
get busy cleaning up the garden for winter!!!

Thanks, Sarah