Do any schools on your kid’s list require FAFSA for merit scholarships? There aren’t all that many that do…go to each school’s website and/or call admissions to understand the requirements.
Technically FAFSA is in your kid’s name, and if so motivated they can look at the information. If the college your kid ends up attending has questions on the FAFSA, they will talk to your kid, not you (unless your kid gives them permission to talk to you). Also, based on the fact that you won’t qualify for need based aid, it is relatively easy for your kid (again if so motivated) to estimate minimum income/asset levels based on the FAFSA EFC or even reverse engineer the results with FAFSA4caster.