I think Ford hit the nail on the head with the S550 Mach1. Ford " likely " will never build anything like it again. The S650 platform and beyond are for me too futuristic. The prices will speak for themselves.
For me the premium leather bucket seats were an ABSOLUTE MUST, non -negotiable. Heated , cooled and the accent stripe paying homage to the original 1969 Mach1 .
Welcome ! Grabber Blue is a fantastic color. It definetly "grabs" attention. Yes '22-'23 are the only years for the M1. Stick to your guns and wait for the right one. I waited 3 years and it was worth it.
If the GT350 means so much to you I'd do everything I could to keep it. Like others have said get a beater to haul the family around. Sure, GT350's will be available years from now when your kids are older but you might not find the perfect car like you have now notwithstanding price and...
You might be able to order from Ford Show Parts. See the web sight. You might have to live in the EU, UK, CAN or US. Perhaps you need friend or relative in one of those countries.
https://fordshowparts.com/?srsltid=AfmBOoq-Tvjb3dVVtLN8I-6MNTbGDBUOApYNRxUYxBWdoDdSHPPPIfkw
For what it's worth I had an Ecoboost Premium MY 2017. It was an excellent car. I had it for 6 years. Really happy with it except creepingly I wanted that V8 exhaust note. No problems except a couple of minor replacements. I have a Mach 1 now and it's not comparable. There is nothing like a V8...