I'm reticent to recommend this, but about 23 years ago before I got a mounting press, I used a regular clothes iron. Making sure there was NO water in the iron, and having it set to the non-steam setting, I set the temp with a dial thermometer, and kept the iron slowly moving over the print. I too used parchment paper as a cover. You have to be careful using this method, but it worked. I still have some prints mounted this way and they haven't popped up yet.