Well, simply route the Group to a dummy track, create a Part with Alt+Click and adjust it so it fits your project duration, then every time you need to render the Group, just enable monitor on the track and use Render in Place. Don’t forget to disable monitor after rendering.
I’m quite sure this can be achieved with the help of Macros and PLE, I mean, just select the empty Part manually, hit the macro, and it does the “enable monitor + render + disable monitor” automatically.
But since I am on @Aulicon ignored list he’ll probably never read this, that’s too bad.
