Dear Peter,
I have had this opportunity on many occasions. My whole family and myself, have OFCOURSE, said the Creed, which is the basis of our common faith, but since the filioque is not part of our tradition, we just skip over that part....
What can be funny is when you are in a Roman Catholic church and congregation where there are many Orthodox present, as I was during the week of prayer for unity a few years ago. What was heard was a tongue tied stumbling more than anything else, and that one second seemed to last forever!
In my Archdiocese newspaper, there was an article earlier this year, or last, that stated that the philioque controversy had been very close to being settled by our respective theologians at their last meeting.
They seem to have come to an understanding that mirrors the understanding of Gregory Palamas and more current theologians like Bishop Kallistos Ware, who really don't see it as the big 'H' stumbling block it has been made out to be over the centuries of polemics between our two Churches.
In Christ,
Alice