I'll second the call for the mult. Also, if you have the O-Coast, you might consider pulling the MIDI interface and substituting something that can get audio into the skiff so the Clouds can chew on it alongside the other sound generation path. The O-Coast can handle the skiff's MIDI just fine via its MIDI 2 outputs since you only have a single VCO, etc signal path in there. Also, don't forget you can crosspatch this with the O-Coast for other functions, such as clocking, etc and then you'd just treat it plus this as a single device...which, actually, would be a pretty beefy device.
One of Ladik's mixers that has panning and line-level stereo outs might be a better fit in that same space where the current Ladik sits now, too...could be useful to sum the O-Coast and skiff's signals together as a single stereo pair, plus you can also use the O-Coast's output for something else entirely.
One thing I was always taught early on was that if you can tandem two full systems together...as in this case...you're really not getting the result of one device plus one device. The possibilities are a bit more exponential, more like two squared. The more you can crosspatch, the more complex and outright interesting the situation gets!