Well, if it's any help, I can dredge up a memory from when I was still in my teens and, poring over my mother's copy of Will Tillotson's catalog, I first plunged into the world of old roses. The description of Cramoisie Supérieur featured a testimonial from a reader describing a wonderful youthful memory of the velvety crimson blooms of 'Cramoisie Supérieur' climbing through an old California orange tree. Tillotson's (now called Roses of Yesterday and Today) no longer lists it on its online catalog, but Angel Gardens does:
http://www.angelgardens.com/ecommerce/roses-by-class/climbing-roses/cramoisi-superieur-climbing-rose.html

And on Helpmefind I found this accolade from a Houston grower: "It smells divine and makes pretty cut flowers, and looks good in arrangements with other antique roses. It blooms profusely almost all year long. No disease and no insect problems. Why hasn’t it been given the Earthkind designation yet?" It does grow big but appears to be very amenable to pruning. Some say 'virtually thornless' -- pictures on the web show it as having a few, though.

I understand Cramosie is somewhat less of a water hog than some bigger flowered reblooming roses. (You are going to have so many roses, Rekha! Your neighbors are going to be gobsmacked. Welcome to the club).

That sounds beautiful! If it works out, please post pictures!

I think you are fine, just don’t give those roses an acidic fertilizer. If you keep your digging about a foot beyond the tree‘s dripline, that would be ideal. My Brightside Cream rose and a Meyer lemon cohabitate very nicely together. Drippers are a great idea, since you can tailor the water to each plant. :-)

I hose water my citrus on a weekly cycle, just fill up the watering trench, that way I don’t have to worry if I have to run the drip more often for the roses, citrus like to dry out between watering.

We get a lot of rain...the only months I have to worry about extra watering is July and August. I think water wise i have no concerns. Have to think this over, and convince DH who said WHAT do you want to do!! I can place it a bit away from the drip line, I have space.

But how would I ever deadhead or prune...i will have to find something that will keep blooming with minimal intervention..and minimal thorns

If you are looking at climbers, it might be a spot for Renae. Thornless and self cleaning. You could include some other roses to reduce the overall price.

Rekha, the answer is long-handled pruners. Also, I expect most of the pruning will be on the bottom of the rose, not the part growing through the tree.