Haven't read the whole thread, so sorry if this has been suggested already, but how about being inspired by the recommendations of Jeff Day:
https://jeffsplace.positive-feedback.com/altec-dreams-and-what-sweet-dreams-they-are/
I should mention that while you can go balls-out-crazy building exotic versions of high-performance Altec's, you can also get great results at affordable prices too.Take for example the Altec A7 Voice of the Theatre loudspeakers, which you can get a beautifully restored pair for around $3500 USD from Gary Fischer, and then have Pete Riggle build a pair of his inexpensive Hiraga-style crossovers for them (around $1000 USD if I remember correctly).
The combination will crush any of the current "high-end" speakers I've heard anywhere near the price, or double the price for that matter, in terms of musicality and the sheer fun factor of their live-like presence, not to mention the personal satisfaction of owning a classic pair of loudspeakers.
https://jeffsplace.positive-feedback.com/altec-dreams-and-what-sweet-dreams-they-are/