In my opinion the best solution is to have the Avalon preamp on the stage – preferable in a rack with the CDM32. Mic > Avalon in. Avalon Out > CDM32 preamp with gain set to 0.
Yes, you can have the preamp in FOH, but that will require a long analog cable running parallel with your multicable to FOH.
My experience is also, tbh once you have found a good gain level, you don’t really touch it any more for the rest of the tour.. -and if needed during the show, you can just Recall Safe the MixRack preamp and Trim it up dB..
Leave it at the stage is my recommendation.