Any question answered...

Right, I need a compact cranks, a very compact cranks.

the standard is 50/34, but I like to be able to have a 30t inner that are readily available, especially with a 48t big ring.

A lots of the compact cranks I see doesn't look it can go lower than 34t in the inside.

Why not Stronglight 80/99/100 or one of the SR clones? Should be plenty available in parts bins/cycle jumbles/ebay etc. Rings down to 28t.

Although as everybody else has already said, your life would be easier if you just accepted that 110mm PCD/34t is the new standard and you need to either HTFU or get an MTB cassette and RD