If you talked to a longarmer and they don't want to do the quilt with the embroidery, they are limiting what they do, big time. Look around for someone else to do it.
There are several on here that do beautiful work, ask them. I have a home stretched machine and I love it. That being said, longarming is not for everyone. I would look for someone else to do my quilting before investing that much in a machine you may not like using.