Weddingbee boards

So I am trying to come up with some ways of including my stepson in our ceremony, without making it go on too long... 

A little history:
He lives with us full time, and has for 2 years (doesn't see his mom at all and hardly ever speaks with her) long story...
He will be 6 as of wedding day, and is a very sensitive and connected little boy.  He is already excited about the wedding (not that he really "gets" it I don't think). 

 Some people tell me to just have him up front with us (he is the ring bearer) and that will be enough.  I have read some horror stories online of kids acting out and rejecting the new parent in front of the whole group which terrifies me even though he and I have a solid relationship (absence of bio mom helps that, he often favours me over his dad for things like snuggles and hugs lol).

So here are my initial ideas to be used as either a single event, all together or only some rolled together.  I'd love your thoughts.
1) His dad and I say a short set of vows TO him but without his parcipitation(I promise to take care of you and keep you safe etc)
2) We do a family hand fasting (fastening?) ceremony where all three of us have our hands bound.  We are doing one anyways for the 2 of us, it would just mean adding an extra set of lines in, or just specifying him by name maybe in our passages.  I'd like to give him the ribbon after (actually thinking of putting it together in a shadow box for him after with photos of the ceremony and a family medallion as he's too young to wear a necklace)
3) We do up a family marriage certificate that he can sign after we sign ours, and his dad and I both sign it too.  A copy will go into his shadowbox also.

So thoughts?  Ideas?  Is 6 too young to take such an active roll in the ceremony?

Thanks!

@MrsStrawberry24: Thanks.  It's been a challenging road to get where we are, but I think in later years it will mean a lot for him to have something to remember via pictures and stories of how he was included.  I've had a lot of issues becoming an insta-mom (I'd only met him once before he became "ours"), so it's important for me also to make the promises for him.  There were many dark days where I was ready to throw in the towel and the thought of abandoning him made me face up and stick it out.  And now I am so glad I did!

we had our daughters take part in a lot of the planning and prep too. my daughter picked out what color the stone would be. she didnt have a lot of options it was red or white lol. my future step daughter made the rsvp covers. they are both in the actual wedding on is a jr bm and the other is a fg. we are using there pictures together as our table numbers. they get a pretty necklace after we do our rings. they are going with me when i get my hair done so they get theres "done" too. they have their own special page in our photo guest book with just pictures of them. we are getting our nails done together. im including them in as much as i can.