security - control per app internet (non-rooted) while using actual VPN?

I am trying all sorts of (non-root) security software that allows me to block internet for apps. so far every one needs some kind of fake VPN to gain access to traffic, I guess so no root is needed. I can't have this since I use an actual VPN which gets turned off if I use any of these security apps. is there no way to block internet for apps while using my VPN?