So if the Mets fill out the roster from in-house the main two candidates are Adam Loewen and Mike Baxter.
The converted pitcher Adam Loewen has 14 MLB games as a hitter under his belt with a BA of .188/.297 OBP. In AAA he hit .306 with an OBP of .377 in 137 games playing most outfield with 1B sprinkled in.
Baxter has 31 major league games had a BA .214 OBP .306. In AAA he played in 246 games hitting .281 with a .361 OBP with 390 games in the outfield and 150 games at 1B.
Maybe Corey Wimberly is a dark horse for the position, the 27 y/o switch hitter has never made it to the majors but in 192 AAA games he has a BA of .273 with a .353 OBP while playing almost every position on the field. Wimberly has been described as a Chone Figgins type but has been slowed at times in his career by hand and hamstring injuries...
A sixth round pick by the Rockies who ended up on the Pirates only after a detour in Oakland, second baseman Corey Wimberly has actually played every position in his six year minor league career as coaches try to find the best place for him: in 2011 he split duty between second base and the outfield positions. A player who reminds coaches of a lesser Chone Figgins, his speed could play well in the majors and should offset his lack of power: he's stolen almost 300 minor league bases but cleared the fences only 10 times in his career. (In his college career, that entertaining ratio was 82:1). source Scouting Book