Q#1: Has anyone heard of a 1954 (NOT 55 1st) Chevrolet (NOT GMC) Suburban with the HYDRAMATIC? YES, Although I have seen more of the GMC'S with the tranny.
Q#2: Does anyone know someone with a REAL 1954 Chevrolet HYDRAMATIC Pickup WITH the checkerboard seats (Specifically Transport Blue <turquoise-ish blue> exterior and two-tone blue-gray interior)? Real 1954 Chevrolet PICK UP with a Hydramatic, YES, several pickups with the tranny. With the Exterior/interior combination you describe, NO
I am sure
Tim Lederman will be by in a short while, he has quite a collection of 1954/5 data and is one of the most knowledgeable bolters on the subject of 1954/5 suburbans and pickups.