This reminds me of the "reductio ad absurdam" that is SedevacantistSingles. Are they still around?
The idea that a regular Trad Catholic matching site wouldn't be sufficient is very funny.
How do you date in a specifically sedevacantist way? The young couple spends the first couple dates throwing darts at a dartboard with Jorge Bergoglio's picture on it? If not, why not just say you're looking for a devout, solid Trad Catholic and leave it at that?
This issue ALMOST makes me sympathetic with those who swing to the opposite extreme and say, "I'm just Catholic. Don't call me Trad, or anything else. I'm just a Catholic." I admire their wishing to abstract from group politics and remember what this is all about -- but with all due respect to such people, WORDS MEAN THINGS and the FACT is that the name Catholic now means a wishy-washy, sentimental and feminine, Novus Ordo, birth control using, no-more-than-3-kid having, immodestly dressing, doesn't know the Faith or Scripture, quite worldly, person.
You can describe your children as gαy if you want to, because they're happy. And you can talk about your intercourse with the mailman yesterday. I will not. Because it doesn't matter what I think a word means -- what's more important is what 99.9% of English speakers will understand by my words. After all, that is the purpose of LANGUAGE. To transmit ideas efficiently and effectively.
When it comes to language, the "objective truth" or "reality" is NOT what's listed in the dictionary, but rather what the majority of people understand by that word. Sorry, but that's the way it works. Unless you're in some kind of language contest where the dictionary is the last word. That is the one exception.
Why not call yourself a Christian so people can assume you're a protestant as well?
Just remember, when a group splits, both sides are NOT at fault. The one who adopted the new course, the new doctrines, is at fault. Nevertheless, the apostate often gets to keep the name! Archbishop Lefebvre wasn't at fault, though he had to add "Traditional" to his name. The Modernists were to blame, even though they de-facto got to keep the name Catholic. Not fair, I know, but life isn't fair.