You want a realistic scale, something that is reasonably attainable and would provide a MASSIVE raise in compensation based on current book rates making the job financially viable for a large number of highly experienced pilots?

For a 50 seat FO:

$36,000 guarantee for the first year, which is $40/hr assuming 12 bid periods and a 75hr guarantee. 10% raise for the 2nd year, followed by 5% raises for years 3-5, then 3.5% every year thereafter to a 12 year scale.

This would mean a 5th year FO would be making $50.94/hr...more than $10/hr higher than current book ASA 50 seat rates.