I did consider this early on but I ended up rejecting the idea as too many characteristics were different. I have another foundling from the Ariege that does match the descriptions but is virtually free of prickles so I'm not sure
...looks alike rosette delizy - bristly pedicels, same foliage, same few prickles. i have them some 5 meters apart. never wondered about similarities but right now they are blooming simultaneously and it is so obvious that they are the one and only thing!
after having compared madiran climber and 'souvenir d'un ami'/loubert(france) which is thought to be rosette delizy, i'm pretty convinced that both are the same variety.
the first set of pictures is showing madiran climber.
the second one gives an impression of 'souvenir d'un ami' ex loubert(france). the blossom in the pictures carried 6 sepals but blossoms with 5 sepals are the rule.