As far as i'm aware, avon have never manufactured RIBs in anything other than hypalon, especially not in the early nineties. Certainly looks like hypalon from the photos. Re: the strip, it should be fine to just glue it on, but i'd check the FAQ section for the best glue to use. Also, henshaws have a guide to how to do minor tube repairs on their site, www.henshaws.co.uk
. This should reccomend a glue also.
Unless the patches are majorly peeling off, I wouldn't replace them. Since its not critical, probably a bit of light sanding, and then applying the glue under the peeling bit should work on the edges of the patches. Make sure that you do this with the tubes deflated, and use a small roller to squeeze out all the little bubbles. It looks tidier if you gently wipe off the excess as it comes out the sides!