Otherwise with adjective + noun

Solution 1:

The three are very similar in construct and interpretation.

In an interview, he said the idea shouldn’t be that shocking. As long as exchanges are carefully regulated, no one would be forced into it. It (would solve an otherwise intractable problem = is the only way of solving a problem that could not be tackled in any other way.)

Excessive wealth is providing fuel for (an otherwise impoverished industry = an impoverished industry that has little or no other source of fuel).

As far as anybody knows, the Albanians have always been there. The Albanians (speak an otherwise extinct Indo- European language = are the only people to speak an Indo-European language that would be extinct unless they spoke it).