I'll cautiously join the 'yes' side.
1. If its only the hall they're using, that might not be as bad as the worship area.
2. They're not going to get preached to.
3. I had a friend whose gran was a JW, said friend and her mum had converted to the RC church and there was no way they would have the grans funeral in the Kingdom Hall. All the JW's attended the funeral at the local catholic church (ok they were last in and first out and stood at the back but they went). I'd think (may be wrong) that to go into a Catholic church would be more taboo than another church that doesn't have all the statues and things.
4. I love gambling on long odds!