Hero's build

I would like to make Necro Hero Olias sometimes as MM and other times as SS. The problem is that I can't replace his scar pattern with a different one. So that means that each time I need to use a new superior death rune or superior blood rune to upgrade his scar pattern whenever I switch his seconary and want to make him have 16 death or 16 curse. Of course, unless I apply both superior death and superior curse to his armor at the same time but that will make him extremely low health. Any idea as how to solve this?

Get the other Necro Hero. Only option I think.

you can salvage the runes out and just keep the sup you're not using like you would an extra scar pattern.

The scar pattern can not be lost and as far as I can tell you always salvage the run out. At the very least I've switched runes out a dozen or more times playing with builds and haven't lost anything yet.

Of course, it eats up one use of a expert salvage kit so it's not free, but it's still pretty cheap - one drop pretty much pays for it.