OK,I think I got it.
Using e-uae, I installed Classicwb ADV (I have vga lcd monitor working nice in dblntsc 640x400),
restored original loadwb to disable Scalos then installed magicmenu.
Colours reduced from 16 to 4, icons still looking nice.
(well, I prefer oldschool look over Classicwb default 'rainbow')
Still testing in e-uae, adding apps - without fastram Dopus is unusable.
Some of BetterWB features can be easily added - installers in MyFiles drawer.
I bought 4mb fastram board, it should arrive tomorrow.
Time to transfer the system to CF card.