The old Early Winters Omnipotent tent had in fiberglass what you want (there is a thread with pix from last year); but, as far as I know, none such are available today. Easton Mountain Products has a new tent with a tight radius carbon hoop, but they don't sell the poles separately, and haven't seen the tent close up anyway to verify the bendability. That's why the manufacturers prebend some of the poles in a hoop, or use elbows at the apexes (e.g. Montbell Crescent).
Quest Outfitters has a good selection of elbows, and if you are only going to use one per hoop, get the Easton alu sections, also available from Quest, as they will tolerate the elbows much better then the carbon that IMO is only reliable in high radius bends.
Roger has a machine that prebends alu without using heat (that affects the tempering); so I know it can be done, but don't know where here in the USA. So elbows are probably the better way to go. Look at Roger's pix on bushwalking.org.au to get clear ideas on using elbows with both carbon and alu to make hoop tents. The link is in Stuart R's Oct 12th post on the 'Spinnshelter - esque' thread.
At one time, I used the type of quite bendable solid quarter inch fiberglass used for pennants for the top arc sections, and typical alu for the lower sections; but was never really satisfied with this approach because an elastic cord could not be strung through the whole hoop.
Sorry that I don't have more info, but hope this is helpful. Maybe someone else can provide exactly what you seek.