Way I understand it, paying for hours in RHS of passenger carrying aeroplanes was reserved for excessively optimistic low timers with no scruples about using their (or borrowed) money to get ahead of the queue. Not that things have always worked out for them as they have anticipated. I have never heard of any company willing to sell hours in their aeroplanes to rated, but not current pilots and I'll be disappointed if there's any. If you, as pretty experienced pilot, succeed at buying cockpit time, this will be new T&C record low. Therefore I'm really unable to wish you good luck.