Having looked at the website for that group
, it appears that it is the makers of components, the manufacture of RVs (people who assemble components to create an RV) and the sellers of RVs who participate in the certification process. It also mentions that one can have inspections done by persons in the group who are certified.
So I would contact the association and see if possibly they can renew the stickers for you. But if all you are after is new stickers I would not mention having done a major renovation as that would pretty much mean you would need an complete inspection and then a bunch of paperwork such as producing receipts for the components you used to prove they were certified components in order to get a replacement sticker.
There have been some situations I have seen where for bringing an RV into a long term resident RV membership camping club in the USA they would only allow a RIVA certified RV to be brought onto the property. That has to do with making sure the components are up to safety standards to help prevent fires due to wiring and gas line being improperly done in a home made camping unit. In that situation it is more critical as RVs on the property are often left unattended for months at a time. Not that things can't go wrong on certified units as well
The insurance company for the camping club was probably the driving force behind that rule.