EOI and Guaranteed Amount Options

We are looking to offer a Flat Dollar Amount for Plan Type 21 to those whose salary takes them over the Guaranteed Amount at 1X or if they have been denied by the vendor for the elevated coverage.

I have been able to make employees eligible for the flat dollar amount who would meet the criteria based on the multipliers using Eligibility Fields. However, an employee can go 1 level without EOI. The issue I am having is that since the Guaranteed Amount falls under a different level for everyone based on salary. The option level specified for the GA plan would need to be sliding based on the individual employee and their salary.