I don't necessarily subscribe to the theory they need to bring in a full platoon for LF. Biggio can already play out there if needed, as can Schneider (kinda), Otto Lopez, and apparently both Barger and Orelvis are being tagged as 2b/OF guys rather than 3b according to Sorrow, the poster who's friend gives him all kinds of seemingly credible inside info. Getting both sides of a platoon for LF seems unnecessary to me.
First step, get Michael A Taylor as your 4th OF, then sign the best starting LF you can, regardless of handedness. I think it's Bellinger, and I will likely hate the dollars and years, but he doesn't need a platoon partner, and if a tough lefty comes in and you don't want both Belli and Varsho in the lineup, Taylor goes in for Varsho instead and Bellinger stays in LF. A guy like Taylor fits so perfectly as the 4th OF on the roster it's almost a crime he hasn't been signed yet. The myriad of IF/OF options that exist on the Jays bench really dont make signing a full platoon for LF necessary at all.
As for 3b... f***ed if I know. If it's not Chappy at the same kind of too many years and too many dollars deal like Bellinger will get, what else is there?
As a last resort maybe you throw Lopez, Orelvis, Leo Jimenez, Clement, Schneider, Biggio and Barger at 3B all ST long until you figure out which guy(s) can hold it down well enough with some kind of rotation. Hell maybe they rotate all of them through 2B, 3B and LF until they find a rental trade, just to keep costs down so they can go after Soto or Bregman in the next FA period, just like the Dodgers did last offseason.