Well, it can be done with a spined kit, provided you're willing to deal with brittle armor. This would be my advice.
I use a brittle piece or two in my suit and it lasts quite a while if you repair it regularly. The chance to weaken an item when repairing it is (40 + MaxDur - CurrentDur) - skill/10, so lets say you've got an item with 75 durability base (which is think is what you get when you choose structural + the sub one that gives it more durability, otherwise is 25) and you let it get down to 53/75, and repair with a legendary tailor. Then your chance to repair is 100%, and chance to damage the item while repairing is (40 + 75 - 53) - 120/10 = 50, so then you'll only bump a point down half the time you repair it. If you let it get damaged less, you have less chance to damage it. The brittle stuff I wear is metal, and I repair it with a +60 hammer, so it lasts quite a while.
Assuming you're unwilling to deal with needing to remember to repair your armor in a timely fashion...
You can't get clean 10 MI on leather. You're then 'stuck' using a horned kit, which will always give you extra properties. At that point, you're just hoping that the 2nd (or 3rd) properties are ones you also need... In this scenario, I think you'll want to use non-powerful, but choose 2 titles. The first being one that'll give you 10 MI, and the 2nd likely the defense one, since in order to get to 70s (or 75s...) you'd be needing to imbue some resists anyway, and plus you don't really case if it ends up not capping or overcapping the resist, since you can just imbue over the top of it again anyway. This will likely lead to a lot of high-end junk though, and horned kits aren't all that easy to come by, even with the new BOD changes.