I wouldn't necessarily give up on your hunter just yet. I don't think it would be that diffcult to get it working with the rest of the group.

If you get your mian dps macro, which I'm assuming looks something like this (sticking the targetting part in, so apologies if it's in the wrong place):

/castsequence [target=focustarget] reset=2 !Auto Shot, Steady Shot
/cast [target=pettarget] Kill Command

(some macros use /castrandom for kill command, but I'm not sure why)

Put that on an actionbutton which you are likely to press and then make a /click <whichever action button you put your SS macro on> macro and put that anywhere else you're likely to press during combat. In theory this should be spamming your SS macro while you do whatever is needed on the other toons. As a disclaimer though, I have no idea if that works

If you make your hunter follow one of your other alts, rather than your main, then it should be a bit further back from your group and so less likely to run into range issues. Put points in improving range if it ends up too far back, and also try and find a weapon with 2.7-2.8 speed for minimal clipping.

Then you just need a couple of macros for petattack, hunter's mark and misdirection and you should be good to go.

If you're set on changing toon, then aswell as priest/mage/lock you might want to consider an elemental shaman for the totem buffs. That would also give you the option to switch between a shaman or priest healer if you felt like changing things around at a later point.