The keys are not bead blasted, but they are pitted/tarnished; the tenor was a relaq.I would stick with the same thread, it's not dead.
Silver plate does tarnish, quite quickly under some conditions. And when it does it's very difficult to get the shine back if the finish is rough, it tends to always be a bit grey at best. I would be tempted to go with the earlier suggestion of having it gold plated.
Are the keys also bead blasted? If not you could keep those silver and they will polish up nicely and not need a repad if just the body is plated.