If the labels that have the bands you mention do not do US releases, it is likely because they do not think there is any sales potential for the material in the US.
The average US radio station does not have access to foreign releases, and would be concerned that the might either have rights violations or have the label slap them with a C&D for playing an unreleased album or song.
And even a station that might be willing to take the risk would end up buying a lot of useless material and perhaps find nothing impressive. Many "English" lyric European songs have rather bizarre word usage and pronunciation. Others are simply styles that are not appropriate at any given moment for mass US audiences.
If we take the "classic" in classic rock to mean "Having lasting significance or worth; enduring" then no new or unknown song can be classic until it becomes established and venerable. So your whole suggestion is contradictory to what "classic rock" actually is.
Again, you ignore the fact that turns of phrase or figures of speech are not necessarily literal. Technically, by your pedantic interpretation, "classical music" could only refer to very old works of music. But to musicians who specialize in symphonic music, even a recent composition that has the same sound as "classical music" is accepted as being "classical music". No one disputed that Aaron Copeland's "Grand Canyon Suite" was classical music when it was first written and performed.
Likewise, "classic rock" began its existence as certain kinds of rock music that stood the test of time, but in short order it came to mean a genre of music that had a particular sound. It evolved into a specific genre of music.
As for sales potential, anyone with a lick of sense recognizes that without radio airplay, it's almost impossible to achieve mass market sales. The fact is, since downloading is replaced purchasing hard copies of recordings, and when hard copies are purchased it's usually through an online vendor who ships the product via common carrier, the is little need to persuade American brick and mortar record store chains to stock your product.
You are correct. So it should be easy for them to get the paperwork done within their company, get the licensing done, and the get the promotion department to send the music to the radio stations. Maybe even take out a trade ad in Billboard to let them know. That way the radio stations know. You've suggested that radio stations advertise so people know about them. The same could be said about these particular artists.
BTW, you might think their music is classic rock. But if the label feels they might sell more records by getting airplay in another format, the label will take it to another station. I'm often surprised by the way labels classify music. It's not always as simple as we think. If you think there are a lot of suits in the radio business, you should hang around with the record labels a while.
I don't give a damn what the labels or the radio industry suits want to classify a song as. In the context of "Classic Rock" Evolve or Die", the evolution of classic rock will either move in one direction, in which case it will live, or in another direction, in which case it will die. Your pedantic nitpicking just doesn't matter.
Are you just arguing to hear yourself argue? First, you claim that one of the several sources of new "classic rock" material is unavailable because the Europeans don't have the right papers. Then, when you're shown that they do have their papers in order, you counter with it's their fault they don't try to persuade short-sighted, imagination-free radio suits to play their music. It's not about that. It's about getting you narrow-minded suits to expand the scope of your thinking for one freakin' kind of music. One. Not all of them. Not pop, not dance, not ethnic, not any other kind of music. Just one particular radio format that happens to have the same name as a genre of music.
Why can't you understand that?