I've seen Dr Ruppel clematis here, pppeatfruit, it is a larger flowering clematis with flowers darker and not quite as large as Nelly Moser, not a fast grower and 'type 2'.
What about jasmine trachelospermum: that grows fast! Or even Bougainvillea?
The main reason my roses are doing OK at the moment is they are in large pots in the warm sunny south facing patio. Except for New Dawn who survives and flowers well under the oak tree for some reason, and MMe Alfred Carriere who has plenty of space to herself on a North East facing high fence which she loves. But Dr Du Jamain didn't like his North West position, found the competing clematis next to him too much, and died.
This isn't ideal, as the reason the roses were bought in the first place was to go in the back north-facing garden in various carefully chosen spots, but I thought I'd give them a year to settle locally first.
This Autumn is designated for rose transfer from the patio pots to the back garden, so that they can spread and grow properly, but I'm not entirely sure they will, as its less sunny, which is always a little bit nerve racking.
I frequently garden in my pyjamas in the morning in the summer, and as I look a fright, I'm sure any neighbours who happen to be up at 6 am (rare) avert their eyes quickly.