I understand what you are getting at wujimon, but I'm going to take a shot at your terminology.
To say PRC sets is too vague, you mean state sponsored sports sets. After all, Chen vilage is PRC so the Laojia sets are PRC too.
I also have to say that Xinjia and the sports styles are not so closely related. What people call Xinjia (this is a village term) comes from Chen Fa-ke, and thats as good as Chen lineage gets. When Chen Zhaokui came back to Chenjiaguo what he was doing doing was new to the village, but it may not have been new to the family line. This at least is the stance taken by the disciples of Chen Zhaokui. However, both sides in the debate have political agendas to serve.
My personal feeling is that short forms suck, and learning them is a waste of time. Leave them for the grannies at the community centre.
"The heart of the study of boxing is to have natural instinct resemble the dragon" Wang Xiangzai