With 13-man pitching staffs, platoons are limited. Pure platoons, where one player always starts against lefties and his platoon partner always starts against right handers are very rare. Much more common is the usage of hitters that get the majority of their starts when they have the platoon advantage. Given their stats for previous years, it would make perfect sense to get Farmer and Solano in the lineup every time against left handed pitching. This is reinforced by the dismal numbers that several Twins left handed hitters have put up against left handed pitchers--Kepler, Kirilloff, Wallner, and Julien.
I would add Royce Lewis to the everyday player list and note that the catchers on the Twins alternate. Taylor gets some days off against right handers, but he is also pretty much an every day player.
As for pinch hitting early, I agree with @chpetit19 that having an opener does change things and might necessitate an early move to the bench. Outside of an opener scenario, I also recoil when Baldelli goes to the bench in the middle innings, particularly when the Twins are ahead or a superior defensive player is removed.
I wish the Twins had a more set lineup where 4-6 guys were always hitting in the same spot, but given their roster, that will not be happening at least this year.