@Kieran_Levin found that there is a hot plate that happens to be almost exactly the size of an Expansion Card PCB. For anyone planning to do prototyping at home, this is a pretty convenient shortcut! https://www.seeedstudio.com/Mini-Hot-Plate-Preheater-MHP30-p-4751.html
Never mind hotplate, where do you get those tweezers?
…although the hot plate looks like it would be very good for keeping a small
espresso or a tiny Burrito warm.