Requested WoW macro

I’m looking for a series of 3 macro’s that help me speed up the time to change between Engineering tinkers. I want these macros to

1) Apply ‘Frag Belt’ to my currently equipped belt, regardles of what tinker is already on it.
2)Apply ‘Invisibility Field’ to my currently equipped belt, regardles of what tinker is already on it.
3)Apply ‘Nitro Boosts’ to my currently equipped belt, regardles of what tinker is already on it.

Being able to quickly change between tinkers when shortly out of combat can really improve my performance in challenge mode dungeons.