Rule for Custom Frequency for quarterly recs on off-quarter months

Summary:

What is the best approach for creating a rule that allows accounts of a specific account type to be reconciled on off quarter months for Q1 and Q2, without impacting the accounts with same account type that are reconciled monthly?

For example: We have an Accounts Receivable reconciliation with a quarterly frequency, but the business wants to reconcile it only in February for Q1 and August for Q2, rather than in the standard quarter-end months. At the same time, there are other Accounts Receivable reconciliations that are monthly, and we do not want this logic to interfere with those profiles.