If I wanted a skinny, long car, I'd buy an MGA
layful: ( a fine car, by the way).
Honestly, if I really wanted a Spridget that was easier to get in and out of (and I had a huge budget), I'd cut back the area where the door hinges are and just make the door longer at that end (yes...this would require fender mods and all sorts of cowl reinforcement and modification).
Once you're actually IN a Spridget, there's a fair amount of leg room if you have the thinner seats (like in a Frog). I'm a bit over 6' and weight around 210 and it's not even a slight problem for me......once I'm in.
But getting my left leg in at times (LHD car) can be a challenge.
Maybe because I'm 62, but even when I was in my 20's, it was a challenge.
My MGB and my Miata are much easier.