I appreciate the help searching! The issue is that BellaOnline gets 20 million + pageviews a month, and the promo block is at the bottom of every article. This type of code-intensive solution would be a *huge* amount of processing time involved to keep re-inserting the same static text block.
It really makes more sense processor and time wise to do that once, when a content island is generated, vs doing the exact same thing over and over again every time a page is sent out. So if there's no simple way to do it, I guess I'm stuck again with a mod and with the plea to have this be a standard part of the code. Surely other people were using content islands? I do like RSS feeds, but they are for a completely different purpose than content islands ...