Quite frankly, with only 35mm equipment, you are just plain out of luck; unless you can find some way to obtain a large copy negative with which to print. If you really want to try the cyanotype process then get some 4x5 or 5x7 film and make a pinhole camera. Use the negatives to make cyanotype contact prints. Afterwards, if you really like the results then save up for a LF format camera.