I've been thinking about ways to make your live easier. I came up with a couple of solutions, but this one seems fairly OK.
I convert all keyboards to PS2:
- A4000 with lyra I have
- Amy ITX has native PS2 option
- For X68000 I have a ps2 adapter
- A3000 I buy a PS2 adapter from you
- Except for V4SA, I connect a logitech unifying dongle to the keyboard USB, that works, I've checked.
I also convert mise to PS2:
- I buy 3 DB9 to PS2 converters from you for: A3000, A4000, V4SA (mouse USB of V4SA doesn't work with Logitech unifying

)
- Amy-ITX comes with native PS2 mouse option
- X68000 never really use a mouse with it
I connect all PS2 mice and keyboards to ATEN CS84U KVM switch and hope it will convert all PS2 signals properly so I can connect 1 (or 2, separate one for mouse and kb) logitech unifying dongles.
I use a logitech keyboard & mouse (e.g. MK850) that works with 3 wireless profiles (i.e. KB & Mouse can connect to up to 3 unifying dongles each (not at the same time)), which connect to:
1: My PC
2: the Aten KVM switch
3. the V4SA keyboard
i.e. when using the V4SA, the mouse is connected to the KVM switch dongle, the keyboard to the V4SA dongle.
I connect all Joystick 1 ports via DB9 femaile - DB9 female cables (can you make these?) to a RS232 4 port switch.
I connect the joystick via a DB9 male - DB9 male adapter/short cable (can you make that) to the RS232 switch
I'll manually swap DB9 cable between V4SA & X68000, since I lack one port on the RS232 switch.
This would then look something like this schematically.
