I have already attended SSPX Mass and received the Sacraments there several times, on vacations in the past. My thinking was the Blessed Sacrament was so much more important to me than my issues with who is sitting in the Chair of Peter.
Also where I live in Spokane is 30 minutes away from Post Falls, SSPX and have also attended Mass, and Sacraments there.
You see what is happening because of the closeness in miles the young adults from each parish, SSPX and CMRI are uniting in marriage, therefore, the parents and relatives are coming together. It is to the point already that Post Falls parish are sending their children to Mount St. Michael school for reasons of their own. Not saying all of them are doing that but here and there and every year we receive a few more. Our Bishop and parish priest nuns also know their beliefs about the pope issue, but so far at least as I know it hasn't been a problem. Perhaps it isn't a problem because from the pulpit the priest during the sermon never speaks about Vatican II and the crisis with the pope. Our sermons are about the catechism, feast days, monthly dedications, stories of Saints. If one did come to the Fatima Conference always in October, that is when we hear about the heresies and evil thinkings of Francis.
When my granddaughter married a young man from SSPX, Post Falls almost 5 years ago, they married in the SSPX Church with permission of Bishop Pivarunas, but their children when they come of age, the plan is to send them to the Mount. They themselves go back and forth on Sunday for Mass, sometimes they are at Post Falls, and other weeks at the Mount.
I do not know if the priests converse with each other or not it seems Post Falls priests get transferred out more, where we have had the same Pastor now for decades.
I will add it is not a Paradise yet, there are some members that refuse to attend either or depending on this or that. Just saying that because I don't want to give the impression that it is all good.
I hope that helps.