trade harness? advance progress 2...

I have an advance progress 2 size medium harness purchased last winter. It has about 12 flight hours and lots of kiting hours. In very good condition, no damages whatsoever:
advance.ch/en/products/harn … rogress-2/
Would like to trade (with possible money exchange for upgrade/downgrade) for a non-reversible seat board type harness that fits me (5’7" 155#). Most likely size M. Trading since I do not find the progress 2 comfortable while kiting and I do not use the reversible feature. Figure it might be a good time to swap harnesses at the same time as reserve repack…