Do you think we would be allowed to enter???
YES
We were married this past June and had dinner reservations at CRT, the fact that it was our wedding day was plastered all over our reservation and we had a cake delivered from the contemporary resort bakery, no mistaking there.
Our whole wedding party of 8 people were still in their outfits for the day. The 3 men all still had their suit pants and shirts on, although they had left their jackets and ties at the resort, our daughters both had their flower girl dresses on, both mom's had their dresses on and I had my dress on. The only difference in the female (adult) outfits was the removal of head wear (tiara/headband/fascinators) and a change to comfy shoes. I think it's safe to say we all looked like we were 'dressed up' for an occasion.
I wore a bridesmaid dress I had originally bought specifically to go to dinner in. We had planned a dftw, and I had/have a wedding gown I was going to wear, and bought the bridesmaid dress as a 2nd less formal dress to enter the park (CRT was always planned). When our plans changed I decided the bridesmaid dress 'fit' the type of ceremony we had better. (am glad I did, I would have melted in the other dress). Because the dress was bought specifically to enter the park it never crossed my mind that I was going to change out of it.
We didn't encounter any resistance.... infact we experienced the complete opposite and were congratulated by the CM's we encountered. From security at bag check to the servers at CRT. We
were given 'happily ever after' pins by one kind CM. We were stood by the partners statue for a good 15-20 min waiting for my parents (they forgot their park tickets

) so not inconspicuous at all
If we had booked the ceremony we had from the very beginning, we would never have been aware
of dftw's 'no dress' rule, it's not advertised on the main Disney site..... no-one ever mentioned it, when booking CRT exitedly on the phone..... When ordering our cake.... When at security at the gate...

. infact even when we had a dftw booked and our planner was aware of our CRT ressies she DIDN'T mentioned it, I learnt about it HERE. It wasn't on the dftw site then either... They have added it to the memories t&c I know, but they weren't around when we started looking and booked.
So to get back to your question.... I don't think you'll meet any resistance. I hope you have as magical day as we did :hug
To give you an idea this is what I wore: (on the model.... I wish I looked like that lol)