jen,
a learning curve for you, with the oven. my thought is the oven temp even with the door open would have been too hot, 'destroyed' the properties of the honey, (overheating honey makes it darker also) not to mention the melting of the drawn comb as you experienced, and maybe some melted wax in your honey? bummer, but i would still consume it.......
i recently had two frames of honey, one a deep frame i had saved to feed back to the bees, and one, a medium frame. the frames on these were broken. the deep frame maybe could have been repaired, but the age of the comb made me decide to not try and fix it. the medium frame, beeswax foundation, and the frame on the side was split from the top to the bottom, not going to fix this. i wanted to salvage the wax, and i wanted to salvage the honey in them to feed back to the bees. i pulled out my uncapping tub, but your setup would work. i placed both of these frames in it upside down lid on. took it to the garage, (unheated) placed the tub on a workbench with halogen lighting directly above. i fired up a coleman propane tent heater safe for indoor use and heated the space to about 90 degrees +. the honey ran out in less than a day.
a space heater would work, and i do have one, and have used it for the same purpose, but the little propane tanks are cheaper than electric space heaters.........
ps i have done this a multitude of times to salvage a frame of honey ......
and used a space heater in a small room of my home.....works like a charm