Isolate him ASAP mate! I mean down wind, other side of the yard, whatever it takes,...a little pollen can partly knock up the whole lot if they have even the earliest fuzzy crowns...
I've not breed, so pollen storing isn't something I can offer much on, though freezing it is common. Store it in minimal volume container, less air the better,... Do you homework on this, folks here can help as well!
Nim's look lovely mate, classic NLD type landrace there!
Fat Pete's Cookie is a winner too Smokey, beefy sized
... Are you posting in the Fat Pete SSSC thread, even just for fun?