Thanks for the clarification
Whilst it's cool that you have shown the constraints of the sig sizes I see there is a bit of of a problem.
If a design is done @ 100 x *** and then once the requirements are met by the member who is now entitled to 150 x *** then it isn't proportionate which means the whole design has to be redone from scratch, some designs are really complicated and are not easy to re-create to fit the dimensions required .... just a heads up
100 x 433 is proportionate to 650 x 150 whilst 600 x 92 is proportionate to 650 x 100 ... it can get kinda complicated but I think you catch my drift
Here's a proportionate pixel scale downwards from 650 x 150 ... I can show you other scales if you need them