IMHO it is not really a problem.
Gong has a now a range of six front wings ranging from 60 to 100cm (500W motor ?) wingspans. The wing chord (including mortise = female part) varies accordingly and the set screw position too. So if a rider wants a smaller/thinner wing to go faster, (s)he needs to get a fuselage with shorter tenon (male part).
Which can do more can do less: IMHO, for a strapless use, the long fuselage (for L or M wings) should work with the small Fwings (60 and 65). You will just have to drill one or two extra holes in the fore part of your long fuselage … The small wing mortise will just be 2" (5cm) shorter than the tenon so to be aesthetic and flush, you just need to… print a ring. It is not only cheaper but you can swap the 2 front wings very easily for a beginner session. If the whole foil was too slow in turns for your likings, then you could buy the smaller fuselage (69€).