I made some progress today, instead of buying cca 15€ USB interface from china I have built a parallel port harness with using ppjoy schematics for TurbograFX joy - this thing can have up to 7 (!) joysticks with 5 buttons each so it's perfect for me. And it cost me 0,78 €! Don't forget to set "bi-directional" parallel port in bios!
