Wonderful comments, thank you all. And good to see that everyone has heeded the 'pie in the sky' caveat at the start! God bless PPRuNe
Well the main driver is to have something totally different, time/money not particularly an issue. More a project to grace the back of the workshop until being unleashed one day.
BPF: Thank you for highlighting that strapping a far larger, more powerful and torque-ier engine coupled to a prop which will also create a larger torque component will require airframe modification to avoid it opening like a tin of corned beef midair...
NearlyStol: I am afraid you are wrong! I am indeed indigenous to England! However, I do not find myself bound by the normative European methodology when it comes to modifications, instead favouring to be rather more outlandish perhaps, and then raining in. The sky is the limit after all!