The player that loves to play goal is unique. Most look at as a punishment. It is easily the most critical position on the field at any age or competition level. It's not just to physically stop the scoreboard from piling up. It's to be the leader on the back end of the field. The goalie is an intimidator to the offense and the leader of the defense.
Goals are not given up by the goalie or the defense. They are given up by the team.
Don't be afraid to move players around as well. That defensive player may be able to take a nice corner kick or free kick near the goalie box. Diversity in their experiences is a good opportunity for everyone. They may love it. Find the balance for your team and experiment.