Rob[atSound-Rehab]
if you stay offline (for most of the time) you could simply disable the win update service. i did that on one older machine where i did not feel like buying into win10 pro (for 4 other PCs i did and i'm happy with, though).
basically if it is an all purpose computer i'd go with win10 pro. if it's a DAW with no other use, you can stick to what you have, disable updates, and every half year or year allow it to update (in case you acquire some really hot new software) but take a disk image before
IMHO, this is probably the best advice. Stay offline if you wish to avoid updates. If you do need to go online, you really should do so only with a fully patched Windows!
Get a cheap second PC, or a Chromebook or something, to go online with. Dedicate your DAW PC to offline use.