Instead of mayo try 1000 Island Dressing. One Thanksgiving night when we were raiding the fridge, HORROR! No mayo nor even whipped salad dressing! After that, we ensured the fridge was properly equipped every Thanksgiving, with 1000 Island Dressing.
That sounds like a plan!....Thousand or Russian would be great in that sandwich....a Turkey Ruben with stuffing instead of sauerkraut :>)