I have one of these and it is a good soldering iron. It gets pretty hot. It has a blade attachment that might suit your needs.

https://www.amazon.com/LEXIVON-Multi-Purpose-Self-Igniting-Adjustable-LX-770/dp/B07M9ZKK9T/ref=mp_s_a_1_3?dchild=1&keywords=Lexivon+solder&qid=1622761699&sr=8-3

Not those but a very similar one

They put out crazy amounts of heat

$40

LEXIVON Butane Soldering Iron... https://www.amazon.com/dp/B07M9ZKK9T?ref=ppx_pop_mob_ap_share