PFL - Every 3/4 months probably, I practise the drills often when I get time in an aircraft before the flight, but I do need to fly them more often.
Stall recovery in cruise - If I'm carrying a passenger who wants be shown what a stall looks and feels like I'll demonstrate it (once or twice a month...)
Stall recovery from a simulated approach - Couple of times a year.
Cable break - N/A
Fire - I make sure I'm confident in doing all the drills.
EFATO - Every club check out
Inadvertent flight into IMC - I do need to book a flight with an instructor to get a bit more instrument time.
There is no reason why a licence holder could not do this every other flight, keeping their judgement of the glide range sharp, and getting used to gliding it in in different wind conditions with the option of a go around if need be.
Never thought about doing that (mainly because parachuting where I fly prevents many overhead joins). Will give that a go traffic permitting!