there are other layouts with numpad, like 1800, or nym96/melody96.

also, you always have the option of a separate numpad. with it, you will have more options than southpaw or full.

you can use any kit, as long as the pcb supports mx-style switches.
boards at that range usually don't offer good typing experience, unless you put efforts to make them better.
maybe you should start by stating your budget

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Just saw this by the way. If it's really urgent I guess you will need to buy it in person.

I don't know.....maybe you can ask a seller?