Primegrid is already accepting donations in GRC and their admin (Rytis Slatkevičius) is a long-time Gridcoin supporter. It's a less known fact, because they actually didn't need much donations so far, since Rackspace was covering them 100%.

http://www.primegrid.com/donations.php
https://www.gridcoinstats.eu/cpid/026dde8d3daf1a497a97ce692dfae76a