Most people are moving to Teflon hoses, these have no life limitations apart for being inspected for damage.
Do you have a link to an STC able to override the maintenance manuals? When I talked to my mechanic, he told me that even though the PTFE hoses themselves have no lifetime limit, they do not override the manuals setting "due to the position where it is written in the manual" (or so was his formula). We solved it for now by putting it on the on condition derivations section, but would be nice to know another way.