No I have not, and I am not quite sure why you would want to. Sweet peas grow perfectly well, either in the ground or in pots being watered and fed as for other plants.
is there some particular advantage that you think this method would have ?
Edd, there is still time to use the toilet tube method and many people find this the best way. I prefer 3 seeds to a 9cm. pot and then when ready, I plant the contents of the pot without any root disturbance. I do it this way, because I find it hard to get the watering right in toilet roll holders.