I have a better idea, have it use the following travel path
Queens-bound: down 3rd Av, right on 139th St, left on Morris Av, right on 138th St, left on Deegan Expwy, take I-87 south to RFK Bridge, then Astoria Blvd and regular route to LGA
Fordham-bound: take RFK Bridge to Deegan Expwy, take I-87 North to Exit 2 (Willis Av), right on Lincoln Av, right on 3rd Av
It would allow for a connection to the at 3rd Av/138th St, providing access from the Southeast Bronx (such as Soundview, Hunts Point, Parkchester) to Queens and LGA Airport.