I'm not sure why you'd make a significant $/trade investment in 2 SP, especially without having Wicks/Brown outgoing that offseason. For me the team has 4 additions of significance to make, you can turn the dials on your preferred amount of money/prospects to invest in each:
Catcher - FA options here are mostly Jansen and possibly Kelly, trade options are probably more pie in the sky but could include most of the AL West(O'Hoppe, Langeliers, Raleigh). This is also a place where I could see a buy-low trade of some sort but probably not a Busch trade for someone with no MLB experience given the position
Bat - Yes, even with Bellinger opting in. The team needs more thump if it's going to go with a defensive spine of Amaya/Swanson/Hoerner/PCA. FA could include Soto, Alonso, Santander, Martinez; Trade options include Vlad, Tucker, Brandon Lowe, and certainly others. Possible to see essentially another Busch deal here if the price is right
SP - It's been Jed's MO to add a SP per offseason and with the injuries to the young arms I expect this to be no different. FA can range from Burnes to Eovaldi to Flaherty to Bieber to Buehler, trade options range from a Mariner to a Marlin to Keller and others. I don't expect a buy-low trade given you don't want to pay to add an arm you don't have any more confidence in than Wicks/Brown/Assad/Wesneski, but it's not *impossible*
Late inning RP - too many options to mention, but an 8 figure or close to it salary should probably be expected, or an equivalent trade cost if it's for someone pre-FA