The benefits from my experience with muay thai are:
1- Ability to abosorb and control pressure, fatigue, and pain.
2- A realistic understading of the dangers, pros, and cons of strikes and clinching.
3- A great cardio workout.
I don't see how cross training in the techniques could hurt you, but be careful with your knees. Your shins will be bruised often and will need to be massaged. If you study muay thai, I think you will be able to absorb a very useful perspective that will enhance your aikido. But you may need recovery time which can cut into your aikido training schedule.