Chuckle you may Mike.. But what I was suggesting is a bit different to your method..... LOL !!

I was thinking about providing a Vibrato "On Demand" by using the After Touch facility.
Using your method would certainly provide an improvement, but using the Delay Vibrato would mean that every note held down long enough to allow the Delay to time out, means that the vibrato would be applied to every 'long' note. This may or may not be the desired result....

Using the After Touch method would enable the player to produce the vibrato as and when he wished to do so, merely by pressing harder on the key, and even producing a steady note, then the Vibrato, then back to a steady note.....

As I mentioned previously, I'm a bit tied up at present but will get back with a procedure.....