I would not put your real wedding bands on the ring pillow, no matter how “responsible” your ring bearer is.
It’s up to you if you want to put fake rings on the pillow or leave it empty. If you can find a pair of cheap rings then buy them but if you can’t then just tie a nice bow at the top of the pillow and send the ring bearer down the aisle. No one is going to know if the rings are there or not.
Now, if you want the photographer to shoot the rings, the real rings, on the ring pillow then make sure someone you trust is there to place them on the pillow, remove them and return them to the groom or best man for the ceremony.