Perhaps the following as a kind of “workaround”:
If you would like to use the onboard fx “Tube Stage” for a group instead of carrying an additional analog device, you could also do this with a “patch trick” that requires only 2 XLR cables.
The group (or an aux) only serves to premix the individual channels – in this case the drums.
In this group you create an insert, with its Send patched to two local outputs (e.g. 1/2) and Return patched to any two inputs.
The latter are no longer used, so this group (as well as the individual drums of course) is not routed to the Main (Mix Off).
All elements of the group, such as the processing, the fader itself and even the mute button, remain ineffective – so you can hide this group.
The two local outputs (1/2) are now connected to 2 local inputs (e.g. 1/2 – preferably stereo) via XLR.
And from now this stereo input (1/2) is your group, can be handled in the same way and finally also equipped with the “Tube Stage”.
Maybe I didn’t consider something – then please complain. 😉