Queen palms are not thought of being tried in zone 7, but they are cheap, and easy to find so they are worth a try. Some people have gotten one to survive a zone 7 winter with burlap, and X-mas lights.

Mazari palms may be a good option also, but not until the future because now they are hard to find, and their cold hardiness has not been proven.

True date palms are suppost to be hardy to zone 7b so with protection may work well, as well.

Good luck

Your posting gives no info on the degree of protection that you are willing to do.
I'm assuming you protect quite a bit already (given that you're growing P. canariensis in the ground in zone 7). In any case, try adding Chamaerops humilis and Trachycarpus fortunei in the ground (unprotected).

Sorry, forgot to add Nannorhops (Afghan palm).

Where are you in Zone 7? Sabal minor would be the next hardiest thing to plant. And after that would be Sabal sp. Birmingham. The other Sabal would depend on how much heat you get and Trachycarpus need to be protected in cooler Zone 7 climates.