As already mentioned, show me a US Class D with Instrument Approaches that has only 3NM and 1500FT AGL, and abuts Class G.
Anyone?
Hello CASA? Hello?
There probably isn't one.
If you want an example of how it should work.......
Try KYIP and KDTW in Detroit.
8 Nm apart. KYIP is D and KDTW is B.