Sounds like a plan to me! The best thing is to just start playing around with combos and see which feels best.

One thing to try is this: put similar classes on the same account. For instance, I have an account for tanks, one for main healers, one for dps, etc. It makes it easy to to swap characters in when/if needed.

Another benefit of setting up your accounts this way is easy macros. I'm not sure how ISBoxer works since I use HotKeyNet but I imagine it may be similar. For example, if I want to send a command to my healer, I send it to the "MainHealer" window, instead of "Nabok" (inquisitor name). If I want to Evac/Escape, I send it to "DPS1" or "Rogue1" instead of "Fingel." This way I'm not editing a load of text files for each combination.

This also helps my brain! No matter which team I'm using, I always know that F5 will be pre-buffs, F6-F8 will be heals, F1 will be "All Target Tank," etc.