Keeper Trades

My league has keepers. Every team can keep one player from their team next season in our redraft league.

The question is w/r/t trades for keepers. Say a team that is eliminated from playoff contention wants to trade one of their star players to one of the playoff teams in exchange for a great keeper. Do you guys have limits on what trades are acceptable?

For example. Team A is out of playoffs. Team B is in the playoffs and has Quinshon Judkins who can be kept for a 12th rounder next season.

Would your league allow Team A to trade a star player like Puka to Team B for Judkins?

Does your league implement restrictions on these types of trades?