An adaptation of the original for people that have the TPA/TFA version of both Bavarian Cream and Sweet Cream (instead of FW), as well as for those of us who don't want (or don't have) sweetener.
The TFA Sweet Cream is described as being stronger, more milky/dairy, and less sweet in comparison to the FW version. To account for these differences, the amount of Sweet Cream is lowered while Marshmallow is added (per Alisa's recommendations), and the percentages are adjusted accordingly.
The purpose of Marshmallow here is twofold: to function as a sweetener (to both replace the sucralose sweetener AND compensate for the loss of sweetness from the Sweet Cream as a result of switching vendors), as well as to add mouthfeel to the recipe.
She suggested TFA Sweet Cream at anywhere from 2-3% (usually 2.5%) and TFA Marshmallow at 1.0-1.5%. From what I've read, FA works too, but usually their flavors are much stronger than other companies. (However, apparently it's the opposite when it comes to their Marshmallow? I don't have it so I don't really know.)
Anyway, in regards to the TFA Marshmallow, 1% is pretty standard so I initially went with that. That being said, it was good but could be a little sweeter (sweet tooth alert), so I changed it to 1.5% and am satisfied w/ the result (obviously, feel free to use 1% if you'd like). Fortunately, the Bavarian Cream is a 1:1 drop-in replacement.
ALL credit goes to Alisa. Even the modified values used here are from her own comments on the recipe page listed at the link down below.