Why didn't toolbox fit your needs? I found toolbox to be a very reasonable way to install development dependencies on a per project basis while not managing multiple hidden filesystems.
If you want to use toolbx for more isolation you'll have to end up turn off a bunch of features and configuring it in weird ways that ultimately defeats the purpose of having toolbx in the first place....
It is a lot easier to just to cut out the middle man and use podman directly.