I'll try to answer as best as I can and my answers/recommendations are based on United States information.
The only mac compatible software for updating firmware that comes to mind is eScribe, which is used for updating the firmware on DNA chipsets. Something comparable (actually much better, in my opinion) to the smok alien 220w you have been using is any mod using a DNA 250 chip.
As far as your specific requirements:
escribe (Currently with US and International versions for mac, but again, for DNA chipsets only)
Maybe not under $100, but you can find the Lost Vape Triade DNA250C for about $120. It can't jumpstart a car, operate a spaceship or function as a PS4 controller, but it is an excellent mod.
Since it's just a mod, you can use just about any tank you can get your hands on.
It uses 3x18650 rechargeable batteries.
The Triade is solidly built. Mine is going on 3 years old and I've never had an issue with it so I've never had to take it apart. That being said, it does appear to be fairly easy to disassemble/reassemble.