My '74 Raleigh International met the OP criteria for the low-rake fork and geometry. it was definitely not a crit bike in any way, the long curved fork and relaxed geometry with the long wheel-base made for a very stable platform. I never had a complaint about the handling but I used it for fast club rides and training, no reason to need the "straight up" geometry or fork for my riding. I understand why you want to experiment with this geometry.
I'd buy it back if I could ever find it in a NY minute, no idea where the man that bought it went, that was in 1981. A Reynolds 531DB full tube set, including the fork, beautiful lug work and chrome socks front and back and Campy Nuovo Record drive train and hubs, Suntour Superbe brake set, man it was sweet, I didn't know what I had until it was sold and gone.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13