I also use Sony (and Panasonic) cameras, and both their apps just work without an account. That could change at any time, unfortunately.
One thing that could work is to use an older version of the app without updating it. I do this with GoPro Quik, since the “new” Quik app is basically one big advertisement to get you to pay for a subscription to edit your videos.
FellowEnt@sh.itjust.works 3 days ago
Not sure they’re much better, they charge to install an intervalometer app. Its extremely basic functionality that should be there as standard.