Hmm...in that case, Mike...
What if, instead, you were to create a group within Workfront tied to each Fiscal Year (e.g. FY2019, FY2020, etc.), grant such groups to all new users each year (by convention), assign each "eventually archived" Project to the appropriate group (e.g. FY2019), and then at the end of the year, simply remove the appropriate group from all users other than those who might need careful access for auditing purposes (perhaps even a special "Audit" user with Access Levels restricting it from making any data changes)?
Regards,
Doug