I saw someone ask about you putting an M1 chip in their older MacBook Pro and it's not possible

What if I work to do an entire rebuild of the MacBook Pro motherboard and everything else inside would that be possible my computer cost at $5,000 when I bought it in 2015 and if I'm going to spend money on a another computer I'm building a much more powerful desktop that I can run operating systems on without trouble.

But I use logic pro to produce music and many vsts unplugins take years to catch up to Apples updates and operating systems so I'm wondering if I could build a entire new pc in the body of that MacBook Pro using M1 chip along with an Intel chip maybe the Intel would be outside with the computer or maybe I would just put that in my desktop that I build and then use a virtual machine for using logic but I would like the M1 or M2 and I would not like to spend another four or $5,000 on that plus the two or three thousand it will cost me to build a much more powerful PC any thoughts?