If I limit this guy to twenty/ thirty pitches a game will he tire easily?  Am I right that by lowering his pitch count the super low durability won't be much of a problem? Anyone else have a similar type pitcher they have used successfully?

I think you'll be ok with 25 pitches a game.  Depends on how often you want him available.  He can probably pitch almost every single day if you limit him to 15.  

my closer in bo jackson has similar ratings, it has worked well for me i have used him as a normal closer i think with around a 20 pitch limit

http://whatifsports.com/HBD/Pages/Popups/PlayerProfile.aspx?pid=1931099

I assume you mean low durability and high stamina. If so - Fernando Baez (http://www.whatifsports.com/HBD/Pages/Popups/PlayerRatings.aspx?pid=2789776) has been a very serviceable pitcher for me. I have used him as a spot starter who can throw lots of pitches about once ever 7-10 days, but also as a setup guy who can throw 20-25 pitches almost every other day.