If a team thinks they "can find use for him as an everyday player", those teams don't know how to properly utilize players or effectively build a roster. In normal years, Pederson is abysmal against LHP, but quite good against RHP; considering that's the higher-frequency side of a platoon, however, that nonetheless makes him a valuable player—and as a partner with Duvall, the Braves would be very well set-up in LF.
As we've all said ad nauseam, it just depends on how much Anthopoulos has to spend, and (as you note) what needs to be allotted to what is currently Schrödinger's NL DH spot. Nevertheless, if the cost for Pederson is right around MLBTR's prediction (2/$18m), the total for Pederson+Duvall would be ~$14m, which seems pretty reasonable given what the Braves should be able to expect from such a platoon.
I'm hoping Anthopoulos has enough money to invest around that amount in LF, whilst still having enough cash to pay Ozuna or another high-quality DH option (assuming that MLB isn't so stupid as to nix the DH for 2021). Under this scenario (as under most scenarios), I'm fine with the Braves spending next-to-nothing else on the bullpen.