This is not possible as the requirement either forces OSS or doesn’t. Bidders can’t alter the requirements without the contract changing and everyone rebidding.

This is not possible as the requirement either forces OSS or doesn’t. Bidders can’t alter the requirements without the contract changing and everyone rebidding. Imagine a contract for a road that requires maintenance and the 9.5M bidder offers to lower by a million if they don’t provide maintenance.