Huh, thought this was MY thread for a minute (pretty sure I made one somewhere).
NeWay, what I eventually came up with as a result of relearning the game is to have different builds (that you change at the Level Up NPC) for each focus. For example, I'm going to have a team support build that'll focus more on buffs/heals/rez and a more solo friendly build that happens to have a few AoE support buffs as well. I tried mixing the two into a single alt at first and I either ran out of powers or slots (causing powers to be under-slotted).