Too many moving parts to come up with such a criteria. Even a single player's value is as subjective as it gets. How much more if it's a 2 for 1, or current player for a pick. True, the closest thing to determine a player's worth is, like the NBA has been doing, thru his salary. But we all know even that is not perfect. Yet the NBA lives by it because that's the closest it could get to a tangible proof based swap.
Stats based evaluation won't cut it. One coach could trade for someone not producing (someone given limited minutes being buried in the depth chart, someone on the "doghouse") giving up a decent player with decent stats if they feel said player could be a better fit. That's gunning for ceiling rather than floor.
Coming up with a criteria is an ideal concept. But not all ideas are feasible. All the intangibles that the two swapping sides (not necessarily the commish's office) take into account make for a tedious, if not impossible, task to come up with such criteria that encompasses any form of trade. People can lobby though, for PBA to come up with one. But I just don't see this happening, maybe not in the near future. Maybe not ever.
Push comes to shove, we might end up adopting the NBA way. Not perfect, but workable. It's not like the NBA is devoid of controversial trades itself. These things are just too polarizing, especially for us fans.