I would let the post/core decide what type of material for me on this one........
-If less than 1.2mm buccal clearance on the post/core, I'd go with MO1 for all four units.
-If more than 1.2mm buccal clearance on the post/core, I'd go with LT C1 for all four units.
The LT will mask out the post/core, but you have to have enough room to do so, if you don't then go with MO/HO depending on how much room you really have. Just to keep everything in harmony, I would go ahead and press everything else the same.......saves some money on the ingots too. Hope that helps.......and as for C1 to 3m1......take a little violet/pink and mix with gray and stain your cervical with it.