USB to PS/2 converters

I was thinking of buying a Unicomp Model M (Because I absolutely must have my Windows/Super key without rebinding any others) until I found out that it has 2KRO.

Correct me if I am wrong, but this means it can only register two keys at once, yes? Meaning if I am playing a game where I am moving diagonally up-left while holding shift to run, and pressing Q to change weapon, the keyboard will not register these keys and attempting to do so will either make the latter keys not work or stop the first two keys?

Anyways if this is the case it sounds extremely inconvenient. Would using a USB to PS/2 converter remove this 2KRO limitation, or would it not help in any way?