I do not see any problem with having a get together on an RSSC ship. On my past cruise aboard the Mariner, there were about 6 couples on board, and there was a group of 8 of us that got together for dinner and/or drinks on a few occassions. With the open dining and the butler service in alot of the suites, this is very easy to do.
I have noticed that some of the gay travel agencies, such as David Tours, have been organizing trips on the Radisson ships. I am sure that they are well received, or they would not be promoting the cruise line. I just checked the David Tours website, and their trip to the Baltics is the end of July on Voyager. Maybe you could get some feedback from that group.