This was my family's church 25 years ago. At the time of my Mother's death in 1991, we donated a church window and had a lovely funeral service for her there. This service was befitting to my sweet mother since it incorporated her friends and some of her favorite singers within it. She also wanted a closed casket but with pictures around it so that people could remember her before she fell ill.
Recently, a dear friend was to have his funeral service at this same church. He was an iconic celebrity who had numerous famous close friends. His service would have acknowledged him best if there could have been pictures and video incorporated into it. But the church said it was not allowed in the chapel. Many of his celebrity friends wanted to sing and to eulogize him. The church said it was not in keeping with their strict mass rules.
The best I was able to get them to do was to allow 40 minutes before the service for some friends and family to participate.
I am never one to question any religion. But I am usually one to question religious "leaders" who care more about their policies than the needs and wants of bereaving family and friends.
There are other Catholic Churches who allow participation to be embraced within a Catholic service. A funeral should PROPERLY acknowledge the life of the deceased as well as to provide a healing closure for those left behind. I don't think it should be about church policy if that policy does not allow for the above.
So, unless you only want a funeral with a very strict mass with no outside participation from anyone else, I sympathetically suggest you look elsewhere. God bless.