The best way to find out is to contact Verizon. The worst they can say is no.
I would think if you have one of their new Shared Data plan the answer would be yes, but I am guessing you also want them to get you a reduced cost Tablet Plus, too?
I doubt they will let you keep your present account if it is not one of the new type, as they are phasing out grandfathered accounts. But heck anything is possible.