Wow, nice out-of-the-box thinking and solution. It is not quite clear to me if you do insert them deeply as designed, or that through your modification you may not have to insert them as deeply (which would change the sound signature following my point above from EtyDave)?
Definitely deeply as designed. It doesn't change much how deep you can fit unless you make your ring out of some extra-large foam tip and your canal is really 'tight' (but even though most memory foams will adapt to your ear canal once squashed into your ears).