I was going to say giant props would make it lag, but you said limit to 1 each so that would be ok. The Santa slay was big and it was fun to use too, also I don't think giant props are an advantage the bigger the prop the easier to hit it. changing the size shouldn't be that hard for Donkie either.
(1) Santa's sleigh has been added. Totally forgot about that one. (2) Yeah, their immense size would compensate for boasting high HP. (3) Resizing props will not be necessary.
I have to agree with Rick, this doesn't seem very fun or different. Perhaps you aren't describing it well enough for me to understand. It just seems like another restrictive prop event.