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Understand that I cant see/hold/touch the razor so this is blind...

Normally that Naniwa 12k every week or every other week will do just fine as a refresher..
So will a Barber's Hone but the...

There is not enough info here to even attempt an answer..

Your not giving us the starting point of the razor, we are assuming that you mean touching up a razor that has just started to slip from...