Since his return, Lewis has 1.5 fWAR, tied for 5th best among MLB 1B over that period and his wRC+ of 132 is tied for 10th. And while his defensive metrics aren't the best, the eye test tells me that with a little more playing time he can be league average or better in the field (see Mauer, Joe).
Lee, since 5-22, when he was moved to 3B, has 0.9 fWAR, 17th among MLB 3B with at least 170 PA (roughly 3.1 PA/GM since his move to 3B). His wRC+ is 102, league average, but his 11 HR and 36 RBI are 9th best from a 3B over that time period. He grades out slightly above average defensively and the eye test agrees.
Clemens, since 6-26, when he took over primary duties at 2B, has 0.5 fWAR, 15th among MLB 2B with at least 100 PA. His wRC+ is 98, league average, but his 8 HR and 21 RBI are good for 1st and 4th from a 2B over that time period. He makes the plays he's supposed make in the field and grades out about average, which agrees with the eye test.
I'm not going into the SS situation because as of tonight it changes; Culpepper, whether he's ready or not, gets handed the keys.
Keaschall may get thrown back into the infield mix next season as Clemens probably better serves the team as a utility type player, but this is probably your best bet for 2027.