I'd suggest the opposite. Buy an el-cheapo heatgun for $10-20. If you're using a bread machine, then invest in a router speed controller/triac for another $20. If the HG ever dies, you swap it out with another one - heat control is performed by the triac and is decoupled from the HG. If you're using a bowl, modulation of heat input is a lot simpler. Raise arm. Lower arm. Point HG at ants instead of beans.
IMHO, temperature reading/control on the HG is useless - it doesn't reliably measure ET or BT in any meaningful way. Decouple thermometry and temperature modulation. It'll be easier to replace only the parts the break.
BTW, I've been using the same $20 HG for over a year with no problems, but I did cover the input with some netting to shield against chaff influx.

-s.
Your dog wants espresso.
LMWDP #288