Brendan.
Brendan, I garden at Tweed Head's, about 7 kms west actually. I planted the beautiful Frau Dagmar Halstrup, a low growing, not recurrent, beautiful pink rose. It flowers in bursts intermittantly but the foliage is always a beautiful green - unaffected by disease, blackspot or aphids. It's hardy and needs little water once established. And, with your level 5 water restrictions, it may be want you want, though you'd have to water in in.

We are fortunate enough to have a really good rose nursery near Perth called Melville Rose Nursery in Mason Mill Road, Carmel - not sure about the postcode. The owner of this nursery has been growing roses for over forty years and his knowledge, and that of his two sons, is immense. They grow and have grown a lot of the old world roses. You might like to contact this nursery with your questions and they may be able to help you. Since Queensland conditions are different to Perth conditions, they may be able to make suggestions to set you on the right path. Good luck.

List of roses that do well in hot humid conditions:

Renae rose, thornless pink, climbing, idealy grown over fences, archways pegolas, lovely perfume.

Crepsucule, low bushy growth, apricot flowers, ideal for low fences.

Dutchess de brabant, climbing or shrub form, climbing variety ideal for tall fences.

Sarah van fleet, rugosa rose, extremely thorny, great as a barrier.

Mutabilis, large showy shrub rose.

Cornelia, shrub of climbing rose good for fences.

Madam issac pereire, large rose for fences, sheds or walls.

Buff beauty, shrub - climber, found to be slow growing, needs good mulch and care, beautiful nodding blooms.

Veilchenblau glorious coloured truss's of purply flowers, thornless rose, tolerates some afternoon shade, which also helps prevent the flowers from fading too quickly, thornless, though not a large grower.

Carrabella vertally thornless, great for fences near walkways.

Lamarque beautiful climbing rose, hardy and healthy

You can check out the oz gardening gallery, there I have a post on renae rose on my archway with pictures and a link futher down on another post with pictures for Lamarque, just copy and paste the link into your browser, there was also a post for crepsucule that someone has, with gorgious pics of her on an archway, first time I had seen crepsucule used that way, most times she is put over low fences. Hope this helps :)