The easy answer to that is to have the enroute privalages suggested with approach privalages only in an emergency and with a special call.
This would mean you were treated as an emergency and vectored onto an ILS by ATC:
Without automatic IAP privileges attached to an EIR the pilot is not going to be in current practice or carrying, or familiar with, any particular ILS plate/procedure. In a true emergency any pilot is going to opt for the lowest work load option, ie a vectored SRA approach.
When I did my PPL 27 years ago, this scenario was precisely what the instrument training and SRA part of the syllabus (applicable in those days )was intended to address.