[Nils_Lindeberg]

Maybe just change stand up to mean you give everyone a bonus on you until we are at the same position in the turn, next turn, as when you fell down. If you fell during movement you are considered standing after movement next turn. If you got knocked down after DX count 13, then you are considered standing up after DX count 13 the turn after. Everybody gets to take an action and only one action (including the one that knocked you over) and your action is spent standing up (but with a delay).

In practice not so hard to keep track of. The big dude with a battle axe knocked me down. After he acts next turn I am on my feet again.

The only problem I can see is if I fall during movement where we went last and next turn we go first. But that can be ruled as. If I already lost one movement due to enemies, then I can take the next turn movement, but if I screwed up during my own movement, I will lose one more.