Don’t salt them. Kosher birds are already wet salt brined as part of the kashering process. And yes, the flavor is incredible, because they’re already wet brined. And the same for kosher chicken.
I’d recco you buy one of the TJs kosher chickens and cook that first so you’ll understand how the birds are already salt brined.
I grew up eating kosher birds and that is THE reason why I dry and wet brine my poultry. Because kosher birds taste better from their kashering process.
Read this for more info:
https://cooking.stackexchange.com/questions/19111/brining-a-kosher-bird
Note, I personally do not add salt to kosher meats when cooking or preparing them. I stand by my buy some kosher chicken parts first and try your turkey rub on them before doing your turkey for thanksgiving. The last thing you want is to serve a salt bomb to your guests.