This is your own personal card but your employer reimburses back travel funds for you once you've got a receipt?
I'd check for alternative redemption options on the card first. 'Cover my purchase' or similar. Maybe you could use it for online shopping until it eventually runs out.
You could also buy gift cards and sell them online, but that's a lot more work.
Using your own company as the conversion from points to cash is risky because that's also your main form of income.