Crt Jakhel wrote: " If you freeze them as they are, egg yolks will eventually become so gelatinous that they will be almost impossible to use in a recipe"
Actually, that rings a bell-separated yolks
do become really dry and 'chewy' in the freezer.
Restaurants I've worked in use more yolks than whites, and I've frozen plenty of whites;
you can definitely defrost and whisk them.
Another thing I thought of:
I only separate eggs to whisk whites. Duck egg whites have low globulin levels, and aren't great for baking things that need a lot of 'lift',
so unless there's other reasons not to, maybe just whisk them together?
Mixing the yolks/whites stops the issue Crt refers to, that's for sure.