A piecemeal approach would be a start, and would gradually improve the utility of GA.
Sure it may not work into say Fairoaks (due to LHR proximity) but there are many airfields which do have plenty of Class G, and which are useless (except for the more bold pilots flying DIY GPS approaches) anytime the cloudbase is below about 1000ft AGL.
"IFR" is confusing anyway. No two approach plates are quite the same
Pilots deal with this.
Got to start somewhere.
Clearly one needs to find a way to get the approach control (or whatever you want to call it) solved. After that, "all" that remains is for the airfield to find the money to pay for the IAP design .....