I know it's only been a week but I'm wondering how this is going for you and if you'd still recommend it.
I have everything in 1Password, but Apple's password management stuff has become so good (and so aggressive) that I often find that I'm just trying to keep passwords updated in 1Password rather than having them filled from the program. I still have software license details and some other sensitive information in 1Password, but could theoretically do what you're doing and put it elsewhere...
Also hate software subscriptions and have mixed feelings about 1Password no longer prioritizing the Mac/Apple platform. I might still try 1Password 8 when 1Password 7 fully stops working... but don't have great feelings about the whole thing.
If you go 1PW 8, I believe everything is stored on their servers, while your local vault may be read only or only for recovery, plus is total subscription. So even if you are able to keep something locally on your devices, your main vault will be on their servers, and you are permanently stuck to their subscription model.
Your best bet is to stay with the permanent 1PW 7 license, especially if it is standalone, because that will always run; additionally, because 1PW 7 is a universal binary, it will continue to run after Apple drops all Intel support.
BL.