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If you pay, regardless of amount, the current status must report Paid.
If they settle for less than the full debt, they are entitled to additionally report a "paid for less" Special Comment recording that fact. Paid with no such special comment does not place the issue of amount paid for satisfaction of the debt into your credit file.
So, as a counter-offer, you may have more success getting their agreement not to report rather than to delete.
If you still wish to offer less, include the offer as being contingent upon their agreement not to report any Special Comment of paid for less.
Then the current status will simply reflect Paid, and will read the same as if paid in full to anyone reviewing your CR.
iif it's a 2005 charge off why pay as it'll fall off the report in a few months if it's reporting otherwise a complaint to the ftc should remove it through illegal re-aging which they did to me.