Neat setup Jack, well done !
@Bruce
Just a guess, but https://www.hotwatt.com/ has several options, that could heat it sufficiently.
Yes , hotwatt would work, just wonder what route would be chosen ? Could get a short heater and solder a bung in there 😊 (hummm...sounds like a neat idea 😉👍) I have plenty of hotwatt heaters 😉