I scrapped the knee high muck boots before we ever even finished setting up camp after a fly in. Good boots with good support + gaiters is what I did and I wouldn’t suggest doing anything else. My feet got wet evrery day, but as others said, the alternative is an injury. Get on top of the little knobs, look for game paths even if they zig zag to stay on a more beaten path, and if you hit long patches of water I would just go straight and fast.
Trekking poles are key for balance, but more importantly to use to sort of stab around in front of you to check for holes and pits...those hidden holes can ruin a trip quick! That tundra is no joke, you have to be aware and careful on it.
I also second beendere’s thought on rain pants over a base layer, I did that on both my tundra trips and it’s the on,y way to go. Sitka core light weight with dewpoint pants over the top was very comfortable and worked well in cold rain and warmer clear weather.