If the judgment creditor consents in writing, in such form as the Mayor may prescribe, that the judgment debtor be allowed license and registration or nonresident’s operating privilege, the same may be allowed by the Mayor, in his discretion, for 6 months from the date of such consent and thereafter until such consent is revoked in writing, notwithstanding default in the payment of such judgment, or of any installments thereof prescribed in § 50-1301.50, provided the judgment debtor furnishes proof of financial responsibility.