This situation has become fairly common in many areas. Not just Morgan but most car manufacturers. Then also white goods, tools erc.
When I had the Plus8 there was a gear linkage part that was rarer than rocking horse poo. UKC 3159....etched into my memory. A ' dust cap" that sat at the base of the gear lever. It helped reduce play in the linkage. The weakness in it was the tab for the locating bolt that would fail.Flexing cause fatigue cracks. The solution was to weld gussets to brace it. I eventually, after 3 years, found a source with pre-welded gussets. Just the one part found. I fitted it and kept my "fix" as a spare. The gear linkage was common to many vehicles using the Rover gearbox. I did consider looking to have some made to sell on due to demand. Searches showed Morgan, Cobra, transits all used the box and this part was a common failure. I had tried Rover specialists ( Rimmers, Ashcroft etc) and they didn't have any nor any oomph to source some..
Morgan build the cars. Owners finish them.
The Community work out solutions and we all benefit.
On my MY23 the door inner release became " seized" and tight so door opend from inside via the opened sidescreen. A loose plastc clip. Refitted and while accessible as many places as possible lubricated.