It's very common for people to switch networks many times a day anyway so it's not obviously a VPN user - even when switching countries to some extent.
I initially dropped to 4 days/week in lieu of a payrise (comp remained the same). Did that for a while and since then I've been working 2-4 days/week (3 right now)
It helped that it was a small company and I had been working there for 5+ years, not sure how I'd go about finding a part time software job otherwise. Everything is negotiable though.
Maybe look into a Whoop device. Their business model is unique in the space as it's a subscription, but the tracker itself is solid, has no screen and can be worn a number of ways if you don't want it on your wrist.