You could always replace with one of these and control everything from the stalk.

.Smartscreen Wiper control

I have one fitted to my 1972 4/4 and it gives you numerous intermittent wiper settings. Flick the wiper on once, flick it again at the required interval and it then copies until you cancel. - anywhere between 3 and 30 seconds.

I have the wash/wipe version - when I press the windscreen washer, the wipers give three strokes - modern Mogs have this, but not the older ones.

I've actually fitted a windscreen wiper and washer control on my steering column to replace the two switches on the dash. as it was a right pain in the dark to hit the switches

1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10