I have seen picture of 15703 ST with ceramic bezel!!! IMO, it looks awesome!!!! I think it will fit! The only problem is the cost of the ceramic bezel!!! Last time I check, the steel version bezel for diver costs around $900US. It used to be around $600+ US!!! For ceramic, ........... May be $1200 or more??? Also I think not easy to ask the boutique to sell you the bezel only!!! If you decide to do the combo, please share some pictures with us!!! Good luck!!! 
Cheers