Soulguard, In honesty I'd go to the retreat. Monasteries are relatively safe from the full spirit of the robber council. The Purpose of Monasteries is prayer and giving glory to god through a contemplative lifestyle. If it can make your soul better go. The SSPX is affiliated with a group of Benedictines in Nevada. Avoid tricky theological matters.
I went to a NO Monastery on a retreat once. It was Benedictine. At the consecration, everyone gathered around the altar (even the lay brothers and lay visitors) and raised our hands, apparently concelebrating. We went to confession as well, and the monk-confessor told me that is was 'virtually impossible' to commit a mortal sin.
This was not so many years ago.
In my old diocese, the Franciscan monastery had a horrible reputation for sodomy. Everyone in the diocese knew it was a homo-palace.
Probably the worst example was San Anselmo when Rembert Weakland was rector. The sheer number of stories that circulate about the place is amazing, and the fact that Weakland eventually exposed himself as a ɧoɱosɛҳųαƖ and financial criminal rather removes any basis for disbelieving them.
So yeah....go to that NO monastery...they're harmless. NOT!