If the league is getting a 17th game, they should offer the following to start with:
Replace last preseason game
Either start an additional week earlier or extend season a week later to add 2nd bye week for all teams.
All players on roster eligible to play each week
Those cost the league nothing.
Now add a couple of extra roster spots and a couple of PS spots with no experience maximum (as proposed in new CBA)
Allow unlimited returns from IR (but still with the 8 week minimum)
Increase pay proportionately, ie an extra 1/16th for existing contracts.
Increase playoff pay from fixed amounts to 125%, 150%, 175%, 200% of regular game pay for wildcard, divisional, conference, and Super Bowl rounds
Those seem like fairly bare minimum things to ask for in exchange for the extra game.