I wouldn’t buy into any new cartridge without first spending some time at the range with one.
The 30-06 is going to be a much less pleasant rig to use, than your Creedmoor.
I’d find a rifle that will fit your wife and likely new hunting partner in 6.5 CM.
It will suffice as a “back up” rifle (I’ve never needed one)..... and be both pleasant to use and deadly.
My last five or six elk have all been killed very quickly with my 6.5 CM or .260 Rem.
If you really want something different, I would recommend the 7-08 in the same format your using now.
Nothing trumps good Bullet placement....... that comes with practice.
My $.02
