Just enter a total, the 1099 information doesn’t get transmitted with the return anyway.

Ignore them.  Just enter the revenue from the client's books and records.  They have books and records, right?

"I know you enter on the gross of sales on the Sch C"

Unless that payer is the only customer they have, you don't enter that 1099-NEC as gross sales. It's informational, and should already be included in the gross sales from the taxpayer. It doesn't get added to what they reported to you as their operational gross.

ProConnect only has direct input for any of the 1099 series IF it has withholding.  Even then only the withholding goes anywhere. Include the income into the  input the gross amount into the totals of where it belongs.