Mighty will eat thru your $1k budget in 2 years with subscription fees alone. And you haven't even bought a budget laptop to run Mighty on yet. Mighty does not save you money.

Also not sure where you got the 20 hour stat. Mighty's marketing claims a 2 hour boost. And I'd take it with a grain of salt since active use of Mighty is like running a video streaming service in the background.

when talking about the M1 I had in mind the apple mini pc If you really need a laptop just go with anything comparing the specs In my prev job laptop was required and I had a really good thinkpad, much better than any apple laptop on the office

If you don't need a laptop, just get a desktop, much more computing power per dollar expend