Having only ever been in a 139 in exec fit, I thought seven was cosy enough.
Some routes cannot support competition, they’re a matter of relatively high-risk community service. The Scillies definitely count.
The real answer is, of course, a B-N Islander, and some special provisions, but they would require innovative thinking and regulatory capacity and competence. Neither of which can anything married to EASA deliver, even if contemplating a divorce in which the other half gets everything and still calls the shots.