I have had a few times in mistlands where it took several tries to get my corpse. Those swarms next to mines sometimes catch me by surprise. I found a few things that help.

Make extra wisplights and remember to eat well before you go get your corpse.

Follow your previous path, because you're already cleared it, but still sneak anyway just in case. I know you can't sneak and mountain goat at the same time, so alternate between short bursts of movement when it's clear, followed by sitting still in sneak mode. Move, stop, move, stop. The tall rocks are good at breaking line of sight.

Bring an atgeir, even a spare one from a lower biome will help. Do your mountain goat thing, and if a seeker comes at you, you have a decent chance of throwing it off the rock. Seekers can fly but they're not very smart. Sometimes knocking it away is enough to get past it.

Enlist the help of the dvergr if there are any. And if you can knock down one or two seekers before they kill you, that will make the next run a little easier. If you know there will be soldiers, bring a bow and lots of arrows and shoot from on the rocks.

If your tombstone happens to be down a hole, bring ooze bombs.