Feedbin does this! (Though not with as much cleverness as your suggestion.)<p><a href="https:&#x2F;&#x2F;feedbin.com&#x2F;blog&#x2F;2016&#x2F;02&#x2F;03&#x2F;subscribe-to-email-newsletters-in-feedbin&#x2F;" rel="nofollow">https:&#x2F;&#x2F;feedbin.com&#x2F;blog&#x2F;2016&#x2F;02&#x2F;03&#x2F;subscribe-to-email-newsl...</a><p>&quot;You can now receive email newsletters in Feedbin.&quot;