The two approaches could be an ILS and RNAV I believe. The expectation is one precision and one non precision, SRA can count, or could when I did my test years ago.
Since I did the IMCR I have also done the IR and learned precisely nothing of use that I didn't already know, I got much more precise and current from the additional flying though.
IMCR is more use than EIR because it has approaches. You then have the skills to arrive anywhere in IFR conditions, you can argue about the legalities on the ground with you and aeroplane intact.
As to NDB I've never used one since my test, if there's one in a procedure it's just used as a waypoint in the GPS. It's long passed time the useless things were switched off.