Later Roman spear length

[Mithras]

Here's one that's somewhat high.

There is a 'compromise' grip which allows both without changing grip. Take up the normal underhand grip - spear can be used as per normal for u/hand. Now raise arm - without changing grip - straight up to overhand position ( save that back of hand is now toward head, and fingers face out)
It feels a little awkward/un-natural, until gotten used to ....it's disadvantage....but the swiftness of the ability to change from one to the other makes up for this......

Mmm, I'll have to try that - it sounds like a great way to fight with the spear, providing flexibility.