I thought I had one in Tom Pagnozzi, but he was an All Star in 1992.  I didn't remember that.   I'm determined to come up with one though!  I like a good puzzle.

Ed Kranepool had an ASG very early in his career, add to the fact that he wasn't the primary 1Bman for either the 1969 World Champs (Don Clendenon mostly after being acquired in June plus the WS MVP) or the 1973 NL Champs (John Milner).  So despite that lone early ASG selection/appearance, I'd say he should be here

Ed Kranepool was one of those who first came to mind surprised he was on an all-star team.  Even with that I added him to Club Gantner he definately fits the idea of someone always associated with the team but never a star.

Damn shame Horace Clarke had those 40 some games as a Padre his final season, or he'd be a Charter Member.

https://www.baseball-reference.com/players/c/clarkho01.shtml

I mean he has an entire era in Yankee history named for him!

Rance Mulliniks was right at the .280 mark over 11 season in Toronto, but if you don't round his BA was technically .27978. He drops to a more comfortable .272 for his career.

I think John Wathan meets all standards

Wow, this sure is an exclusive list.  Thought I found a few, but they were only 10 seasons, not 10+.  Bummer.

Rich Dauer and Bob Montgomery.

Thanks ill have to add some more.

You can add Terry Harmon.  Jim Davenport is a near miss because he appeared in a 1962 all-star game.  Buck Rodgers, Mike Shannon and Wes Parker had only nine years with their teams.