A very quick way to support a rose until a better option shows up is a rebar tripod. (Still VERY thankful to Denise, aka Imagardener for this idea!)

Get an 8 foot tube of conduit pipe, cut into thirds and pound them into the ground in a triangle. Into those three tubes drop three pieces of rebar. I use 1/2 inch by 8 foot. You can secure the tops in a teepee shape with a strong wire.

Two tripods a few feet apart can have a horizontal piece of rebar secured with wire to form an archway type structure.

Four pieces of conduit can have two 20 foot (by 3/8ths inch) rebar pieces, bent in the middle, inserted to form a somewhat more secure quad-pod. This idea could also be used to form an arch, if the conduit pieces are more widely and carefully, strongly placed and some form of linkage is devised to hold the two arches in support of each other.