John,
How about this.
We swap your 4.08 for my 4.12, and I also receive the option to swap any RFA compensation pick within the same round if applicable (whether natural or acquired by trade). i.e. 1.1x for 1.1x, 2.1x for 2.1x, 3.1x for 3.1x, or 4.1x for 4.1x
It gives me a guaranteed bump in rd 4 and a potential carrot with RFA comps (which will likely be only a swap of a couple slots at most since RFA comps are at the end of each round), not to mention that if we don't have comps in the same round (or at all) this clause never comes into effect.
How's that for creativity?