Moving Bootcamp created Mac internal hdd partition to external drive where I have my VM

My scenario is that recently I migrated from a mid 2011 17" MBP to a late 2011 17" MBPro (why?: mainly for 16GB vs 8GB ram, and I stayed with a 2011 MBP because I needed to keep a FW port for my Audio Interface and DAW usage). In doing the migration, I had first deleted (or so I thought) Parallels and many other programs from the old MBP so as to pare down what had become program bloat on my old MBPro. On the old MBP, I had began with Win 7 x64 Pro (current Win OS at the time I did the original install) and then upgraded to Win 10 x64 Pro within the VM when that came out. So in creating Bootcamp partition this time out, I had to go back to Win 7 (thanks Apple...no idea why you won't let Win 10 Pro Bootcamp happen directly on capable older macs...). Anyway, Bootcamp partition created fine, but in then bringing Parallels Desktop Pro 15 into the mix, I discovered that my Win 10 Pro VM was still at least partially present and had migrated over to the new MBP. Pleasant surprise, actually. At that point, I decided I'd just go straight with Win 10, and so backed out of the Parallels process, as I didn't want to have to go through all the updating and then upgrading from Win 7 to 10 again. I then copied and pasted the Parallels folder with Win 10 VR to an external drive connected by eSATA to MBP, and deleted the folder from MBP internal HDD. Win 10 VM boots just fine from external drive.

Now: what I want to do is be able to not just run Win 10 on MBP through Parallels, but to cold boot into Win 10 on occasion as desired (to run Magix Samplitude, Acid, and some other Windows pro-music-level software with full processor and memory use available). But I can't see,
a) What to do to have it be Win 10 and not Win 7 that I've got on the Bootcamp partition; and
b) How to move the Bootcamp partition off of my internal MBP HDD and onto the eSATA connected external drive. (I just found it an ongoingly PITA management-wise to have a large NTFS partition sitting there on my internal HDD -I have "NTFS for Mac," so writing to a Windows format drive from Mac is no problem).

Any help appreciated.