Connecting enroute to approach charts

I'm going VNY-LAS. DUATS auto routing came up with a route that ends
at OASYS on V394. Trick is, OASYS is not an IAF for any approach into
LAS as far as I can tell. What should I do if I lose comm?

A related question: some approaches into LAS have IAFs that I can't find
on the enroute chart (e.g. SKEBR on the RWY1 RNAV approaches). How
would you ever get to SKEBR?

In general, how are approach plates supposed to hook up to the enroute
structure? I thought all the IAFs were supposed to appear on the
enroute charts, but they seem not to.

Thanks,
rg