Having to do this is common. Quickest way currently is to probably save a Track Preset, ‘route channel to new group’ (already exists as feature), then load the track preset onto the group.
But then you end up with a pool of unneeded track presets you have to later delete. I usually name these presets with a unique symbol so I can quickly delete them in the file list once I collect an annoying amount. Other way to do is to just drag and drop inserts via mixer.