My go to scopes are Tek Sc502, Rigol SA1052 that the SN was "Bit Twiddled" to make it go to 100Mhz, the firmware is actually downgraded to allow this., Tek 545, and a Tek 7613. Best bet is to watch Craigslist also check out TekScopes groups.io Group for advice on which to avoid.
I did some research, they make "dry" irons also, in other works they don't have the holes in the plate, water reservoir etc. If they don't come with a none stick coating put a big piece of the kapton film they use on 3d printers on the sole/face.
I've thought of that, or taking a surplus heated plate couple a temp controller & apply Kapton film to the surface. I've used heat to get epoxy to flow into areas th seal them in the paste. It was part of an ISO documented procedure.