I think that all the time it is legal to choose freely to go "IFR" outside CAS, they cannot practically outlaw DIY descents through cloud. The best they could do is enforce a minimum MDH of 1000ft - the IFR MSA.
Let's face it, such a pilot isn't going to be flying a normal procedure where one goes overhead a beacon, then straight for 6D or whatever, then a rate 1 turn onto the inbound track, then a stepdown descent when within 5 degrees (of an ADF track which is probably itself some 20-30 degrees out...)
What he will do is fly to a point which is on the extended centreline of the runway, say 3 miles away, get there 1000ft above the terrain, and just fly the GPS-supplied runway-aligned track all the way to going visual.
And if there are no obstacles, that should be as safe as any navaid. The FAA seem to reckon so, and they have far more planes over there than the CAA.