Royces as Old Gods worshippers?

In the new excerpts from Fire and Blood Alysanne tells Alaric Stark that at least a dozen houses besides the Blackwoods had never accepted the Seven, Whilst some of them are probably really minor houses that we've probably never seen, there is an argument that with their reverence of their First Man origins, their House Words being "We Remember", and the fact that they frequently intermarry with the Starks (who before Southron ambitions stuck to marrying into other Northern houses or the Blackwoods with the exception of Aegon forcing Torrhen to marry his daughter to Ronnel Arryn) that the Royces still honour the Old Gods. The only real arguments I can see against it is that the Royces have a strong tradition of Knighthood, which is fairly easy to explain away as they aren't the first Old Gods knights we'd have met, and that Alysanne says "the Blackwoods in the riverlands chief amongst them", however, that could be more down to the Blackwoods make a huge point out of following the Old Gods and the Royces could just not mention it as much rather than saying that the Royces weren't as powerful as the Blackwoods.

I'm interested to know what other people think and whether its worth changing the Royces to Old Gods, as well as any other possible candidates for the dozen or so southron Old Gods houses scattered throughout Westeros?