My guess is that all almond meal would be fine but the dough might be a bit on the dry side. And of course the finished cookies would be sandier; probably like almondy sugar cookies. If you try it, please report back.

In my distant pre-processor youth the nuts were grated with a nut grater that made very fluffy, not-quite-meal nutflakes (haven’t seen one in years). It’s a little metal gizmo with a 2 part handle and a hopper for the nuts that fits over a tube-shaped grater. After filling the hopper, you close the top part of the main handle to exert pressure and turn the grater with the little handle attached to same. Grated nuts fall into whatever you’re holding the thing over. Doesn’t take as long as it sounds, but it’s a real arthritis delight and as I remember our family’s model, on the flimsy side.