As to the two tattoos on one char, at first I thought it was a stupid idea. But then I got to thinking further...
What if the lesser tattoos were exactly half as good as a full tattoo? You could equip two of them (on separate minions), which would open up a whole new area of strategies.
The more I think about it, the more I like it. You'd be giving up significant AC on two minions, but it might make a TT strat (with two LToAs) of some sort viable. An LRoS along with DD familiar and AS. Two LRoEs (are there lesser RoEs?) to improve two minions more quickly.
I'm afraid it would mean a lot of coding on Jon's part, but I think there's something there.