Adding a coil is easy…
Two bored through Swagelok fittings added to your lid and you’re good to go.
Much easier than adding a pour spout to a jacketed tank.
You can absolutely run your evaporator (collection) without an internal coil. I’ve personally run a Mk III terpenator, a 2016 PX1, an ETS MEP, and a Luna IO in production; none of those have coils in the evaporator…neither does BHOgart.
I’ve also run an Iron Fist EX-40 and a 710snob SX-40 which did run heated coils… I’ve chosen to add coils to both solvent tanks and collection pots on machines I’ve assembled, and added pour spouts too…
Personally I’d go with a pour spout. then add coils when I could afford it…