What about this being an exploration into the Seiko VK63 mecha-quartz movement? No need for a GMT movement, just a faded Pepsi 12 hour bezel which could be turned to indicate GMT when on holiday?
37 or 38mm bezel diameter, 46/47mm lug to lug with a 43/44mm lug-hole to lug-hole, sapphire box crystal, bi-directional bezel (for GMT use) and I’d have the ultimate daily driver. Please