Replacing PFM Crown with Ceramic Crown on Existing Metal Post and Core a Good Idea? (photo)

Went in for bonding repair on chipped front top tooth next to PFM crown. Dentist suggested 2 crowns, 1 to replace the PFM crown (14 years old) with all ceramic for aesthetic reasons (grey margin, translucency, etc.) and the other for a better match. I agreed and came back to have the teeth prepped. Asked about whitening and he gave me treswhite take home trays and said he would order the crowns at A1 (currently C1). Concerned as the metal post is very obvious with temp crown (see picture).