I think that you've already answered your own question......... A well sorted +4......
And some Pilates lessons to sort out your biomechanical limitations........😁🤯

A good +4 (duratec), SSL front and rear or Rutherford suspension, remap, a good hood and the seats tailored to your exact shape by Shaun the trimmer at Allon White. As fast, comfortable and civilised as it's probably possible to make a trad Morgan.

An experienced Pilates instructor to help you to maximise you biomechanical potential, flexibility and strength. Don't ever give up on your own physical and structural wellbeing, aging is inevitable but becoming immobile and inflexible is a choice......... Disclaimer.......... My wife has been a pilates teacher for 25 years......🤷🏻‍♂️
You'd be amazed at what is possible..!!!