A simple plan
1. Trade for CL Lou Trivino with Oakland. Trivino has a surplus value on BTV of $1.1mill, which gives plenty of options. 3B/2B Hudson Potts ($2.4mill) looks like an overpay, but I'd be surprised if Oakland went for it. Maybe LHP Chris Murphy ($2.1mill) would get the deal done. Trivino make $923K last off-season, so let's put his first year arb salary around $2mill.
2. Sign Cesar Hernandez for 2B. Hernandez has a Gold Glove on his resume, and has shown the ability to bat just about anywhere, and is consistenly in the 2-3 fWAR range. Last year, he signed for 1 yr / $5mill. 2 yrs / $16mill might be enough. Not sure how Hernandez missed to the top 50 free agent list on MLBTR.
3. Sign a SP. I'll go with Jon Gray, coming off a rough 2020-21 in Colorado where he made $6mill. I am horrible at guessing free agenmt deals. so I can go with the MLBTR prediction of 4 years / $56mill.
4. Trade for a SP using Jarren Duran (BTV surprlus value - $23.2 mill). Some intriguing matches include Northeastern alum Aaron Civale ($21.6 mill) and Sox legacy Cal Quantrill ($21.2 mill). Not sure about how Cleveland feels about moving a SP, but it's not unheard of for them and their OF is full of questions. Neither Civale nor Quantrill is arbitration-eligible until next season.
5. Non-tender Plawecki and Austin Davis
Obviously, the biggest obstacle is the Cleveland trade, which BTV accepts but Cleveland probably doesn't. Dealing Duran to Oakland for someone like Sean Manaea is much more likely. Manaea is inhis last year of arbitration elgibility and will command a lot more than Civale or Quantrill, but he can easily be fit in here.
C: Vazquez
1B: Dalbec (and eventually Casas)
2B: C Hernandez
3B: Devers
SS: Bogaerts
LF: Verdugo
CF: E Hernandez
RF: Renfroe
DH: Martinez
SP: Sale, Eovaldi, Gray, Manaea/Civale/Quantrill, Pivetta
BP: Trivino, Houck, Whitlock, Barnes, Brasier, Taylor, Sawamura, D Hernandez
BN: C Wong, Arroyo, Locastro, and a placeholder for Casas, probably Arauz.
Added cost from trades/free agents: ~$25mill (plus Manaea). Should come in under whatever the budget is...