F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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You might want to look at work profiles. You can use something like shelter from the f Droid store. It will let you configure work profile on your phone.
You can give the work profile any VPN you want, make it always on, and install the apps you want to use the VPN there. Then it won't leak.
That's very interesting. I'm not sure I fully understand the concept, but I'll find some reading to help me along. Thanks for that.
Your work profile is on your phone, but it acts as a totally separate user. It can have its own independent VPN settings. Its own independent applications. So if you set up a work profile with and always on VPN, any applications in the work profile will always use that VPN no matter what.
As far as the user interface goes they're just like any other app but they have a little suitcase in the bottom right corner of their icon.