If you wanted, you could omit R15 and that portion of the dual pot and populate R14 with a 5-10k trimmer and tune the high cut by ear.
Not true to the og circuit but doable.
That portion of the circuit is cutting high frequency before the following clipping stage. The next part, the other half of the pot, is cutting lows after clipping.
I would advise a multi turn trimmers in this instance but it's doable with a single turn. It's just going to be very touchy.