I've just found out that the 30mm Dellorto on my scooter is a 4 stroke carb, how easy is it to remove the old spray tube and replace it with the 2 stroke one

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To be honest its a bit of a pain, I used to do lots of these conversions in the old days but they get rarer even if you change the tube, you need an atomiser, 2-3 needles, 3-main jets etc so it is not that cheap.

If it is a solidly mounted carb don't even think about it just buy a new one its not worth the hassle.

Dellorto Spray tube, 2 stroke for PHBH (for AV atomiser)