>[The "rich key" methodology] still can't handle ways that are part of more than one route (e.g. situations like the I-580, I-80 overlap are actually fairly common).
It can, using semicolon-delimited values. Your example becomes:
highway:network:us:interstate=580;80
As an aside, if OSM didn't have the limitation (or benefit, depending on your point of view, I suppose) of not supporting identically-keyed tags on the same object, I'd prefer to use multiple tags with the same key [on the same way]:
highway:network:us:interstate=580
highway:network:us:interstate=80
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