[Elecraft] Using a K2 with a boat anchor receiver?

[Dave]

Recently I bought an excellent Drake R4A and am struggling to find a 
companion transmitter for it. One option could be to use my K2 as a 
stand alone transmitter with an appropriate "external receiver" output 
modification to the K2 and a "mute" relay fed from the normal linear 
amplifier relay.

I feel sure someone else must have gone down this route, so before I 
reach for the cutters and soldering iron I would like to compare 
thoughts and ideas!

73 Dave, G4AON