Augie,
Welcome to the forum.
Clipdraw makes a "generic" clip draw that attaches to the gun with some type of very strong ahesive. It should work on about any autoloader -- including the R-9.
That being said... I personally wouldn't carry IWB with a clip. To me, the most important job of a holster is to (hear the regulars on the board fleeing this thread as the soapbox makes its appearance) .... protect the trigger. With clip carry, the trigger is exposed.
If you think holsters add that much bulk -- maybe you are using the wrong holsters...?
The R-9, to me, is not ideal for IWB carry. Pocket carry is its natural and preferred position. Even OWB belt carry might be just as good, given the size.
Pocket carry has been discussed ad nauseum here... so I won't go into it again... but you should give it a try. If you really want a clip, try the generic clip draw.
Hope you stick around the forum -- its a great place.