If I had to guess, I think the plan is roughly along these lines:
Trade for Bieber and maybe like Karinchak. That gives you your rotation stability, gives you RP upside, doesn't commit large dollars, years, or even likely trade assets. Something like Canario and Arias is probably not so far away?
Also get a FA SP, but more on your terms. Imanaga is the deluxe version of this but we've seen names like Wacha and Martin Perez connected at least once, and in that permutation I think they're as much to give you permission to trade from the Wesneski/Assad/Brown group as anything
Sign a FA RP to a 1 year deal. If you've gambled on upside with Karinchak then maybe someone like Suter is the pairing? He might be as "successful" an RP you can get to sign a 1 year deal
Wait out Bellinger and Chapman's markets, with the intent of making sure you get one.
Get a secondary bat. This is where it depends on how far the Bellinger/Chapman markets come down and who your second SP is, because there's the range from signing Hoskins to trading for Polanco to playing in the JDM/Belt FA waters, to some type of off the radar trade(Alonso? Moncada?)
The order may change, and Imanaga and Bieber might end up being mutually exclusive for various reasons(they want to invest more in the offense, the market for SP heats up more once you get one, etc). But that feels like the rough contour of what they're aiming for.