Alternatives to a traditional bridesmaid role?

Junior bridesmaids are usually those younger than 16 from my experience. They are the younger bridesmaid who can't really do much to help you, but you want them to stand with you.

I'd explain to them that you and FH decided to do four bridesmaids on each side and those spots filled up quickly. You'd love to have them as bridesmaids, but you kept it limited... it's touchy, but you could ask if they'd like to be a part of the wedding in some other way. Leave it up to them to see how they respond. If they want to be part - they could go with you to try on dresses, help pick out flowers, help coordinate the day of, etc.

Those ladies could fulfill roles such as greeters handing out programs, having guests sign guest book, doing a reading during the ceremony, singing a song if they are musically talented, etc. There are lots of ways to include people other than just bridesmaids. Another option would be to have some of the ladies stand on "his" side. Are any of the bridesmaids his family? Or a friend that is equally close to both of you?

You could have them be your ushers/greeters, or they could do readings during your ceremony.

Hi Laura! I understand that is could be a sensitive issue to discuss with the important women in your life but I find that being honest is the best way to go. I'm sure they will understand that there are limited places in your bridal party and no matter how much you would like, you won't be able to include everyone that you would like.