I'm currently a medic (68W) and want to reclass to med supply (68J). My major concern is that I don't want to be a medic (it's not my cup of tea), but I'm worried that after reclassing I'll end up being used as a medic anyway.
How easily can they use you for your secondary MOS and/or switch you back to your secondary, and is there any way to 'fight' that?

Doubt you'll get 68J (balanced) but you can try:

68K
68R
68S
68T

These are for SPC non-promotables ONLY.

I appreciate it, but I'm colorblind, red-green.

There ar plenty of non-medical MOSs that don't require normal color vision ... you may want to try one of those.

Also, if you change your MOS from 68W to something else and the something else becomes overstrength for whatever reason, you can be sent back to your SMOS.

Something else to think about, if you can't find another MOS to reclass into you may want to consider an ASI, there are several available for 68W.

Here's a good site for 68W ASIs ...

http://appd.amedd.army.mil/Enl_pg/Enlisted%20WebPages/91W_Course_Summary.htm