Pobjoy
I don't know how marshals are going to tackle the engine problems.
As to the radios the whole of aviation is going to have to change to 8.33 because the bandwidth wider of the old radios steps on the 8.33 bandwidth.
At least four manufactures are marketing 8.33 radios with low power requirements suitable for gliders, most fit into a standard instrument hole, one of them can also act as a FLARM display.