“You´ll find that the 'outdated technology' is a heck of a lot easier and cheaper to deal with than messing arround for weeks dialing in an EFIS... unless of course you want an EFIS for some other reason and like projects.”
Not my experience. I started life with steam for 20 years and I installed an EFIS in my VLA 2 years ago. It is vastly easier with HITS and SV.
“It is generally agreed that even LSAs are not stable enough,”
Some are some are not.
“Which microlights would you consider stable enough to be a good instrument platform?”
How about an MCR01 ULC – much more stable IR platform than a 152…
“Perhaps the LAA could do/already does an instrument flight appreciation hour or two through their coaching scheme?”
Yes you can.
Have a look at an MGL Enigma – might fit the bill.
Rod1