The most recent iteration available for the BFR that permits an upgrade to their BFR model is their design of a Bisley grip. So altered as an option it would make, I believe, a perfect "upgrade" revolver project to consider. The frame on the BFR is more robust than the Ruger and the free-wheeling cylinder is a standard characteristic, unlike the Ruger models.
If you work with the BFR Precision Center you can get many custom options from the factory. Only Mag-Na-Porting would be an additional trip to consider. Just my opinion.