Yes, there are probably a handful of companies whom are more than willing to facilitate such a practice for a fee/commission. Fact is, I've known several providers that aren't even registered in ACCRA.
Though you may wish to reconsider because it is CLEARLY stated in your certificate of Insurance that the policy DOES NOT COVER USE FOR ANY HIRE REWARD PURPOSE (Which simply means that the insurer will not be liable if decide to rent out your private vehicle). FYI, usually the premium for a rental vehicle is twice as expensive than of a private vehicle and only entitled to registered Car Rental/Leasing Companines on a fleet level.
Hence if you're still adamant to rent out your private vehicle, GOD BLESS YOU