Even if technically possible, it's unlikely this will be used to support any of the variants you mentioned in Debian. Both i386 and armel are effectively dead: i386 is reduced to a partial architecture only for backwards compatibility reasons, and armel has been removed entirely from development of the next release.
What you said is correct wrt. official support, but Debian also has an unofficial ports infrastructure that could be repurposed towards enabling Debian for older architecture variants.