No. These are the Sapphire Reserve terms: The product is not available to either (i) current cardmembers of any Sapphire credit card, or (ii) previous cardmembers of any Sapphire credit card who received a new cardmember bonus within the last 48 months.
Do you hold any Chase Freedom cards?
I have a Chase Freedom cash-back that I use when there's a category bonus, moving the cash-back points to Chase UR points.