Turns out that, if all you really want is the "Mini Windows 10" environment, then you can drastically cut down the used disk space all the way to just 1 or 2GB.
Basically all you need is the "Mini Windows 10.wim" file (which you can put right in...
I don't suppose it's possible to somehow enable the extended 4096 character path length? I've run into Windows' default 256 character path limit particularly when creating checksum files from EXT4 partitions (which normally lack such a limit)...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi