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Seventh String?

Best use a D'Addario Chromes 4 string set , add a D'Addario Chromes guitar string of around .026 for the C, they are just long enough to reach the 2 tuner posts closest to the nut, as long as they are top-loaded at the bridge. Just thread an old bass ball end onto it to make the ball end large enough.
For F use a D'Addario plain steel guitar string (with bass ball end threaded onto it) of around .018 (.020 is very tight), cheap so you can experiment with gauges.
Buy the single Chromes guitar string first just in case it isn't long enough.
You very probably will not need a new nut or modification for smaller gauges, strings are centered in the slot by string downforce at the nut.