Same here, even I turned into a JR member recently, and have updated my signature as one.
Also, currently this coin is listed only at allcoin, so paying out in GreenCoin might not be such a good idea as it will cause the prices to go down even more once everyone here is paid out. At the start of the campaign the price /Greencoin was 11 sats and now its half, So maybe you might want to consider bitcoin as a mode of payment for signature campaign. But its your call at the end.