Guy will soon have both Cadet and Cadet Major in .22. It is quite an easy conversion.
As to Scorpions , I have a few including .177, .20, .22, .25 and a 6mm bb with a cork adaptor fitted for kids to play with . Guy fired a .25 last week.
Like you, I can't understand why they made the anaemic Merlin in .22 , possibly due to public perception of the calibre and sales? Remember .22 was flavour of the decade in the 1970's