embedding wikiloops tracks on other pages is not officially offered at this time for various reasons.
The approach you took iframing the site may be considered a temporary workaround or as a "hack", and it may cease to work any time depending on server re-configurations.
We might be able to offer a configurable, embedabble widget sometime in the future.
just giving this thread a bump tonight -
the requested embeddable player has just become available on wikiloops.com.
Look out for the "share & embed" button offered on each single track, you may copy the iframed embeddable player code from there :)
thx for sharing & bringing up that issue once more this fall :)