I would be more concerned with the canvas than the Pakosol. I saved my dryer from years ago and I use it to dry the test prints. I would not let an archival print near it. The concerns I had were (a) difficulty in removing the canvas to wash it (b) how to wash the canvas to remove all hypo (c) testing to be shure it is clean. Like I say, I won't use mine for a good print, but I am somewhat influenced by 1980s archival philosophy.

If you really want to use it, maybe make new canvas, and consider replacing it at regular intervals. Possibly using a limited-use piced of blotter paper between the paper and the canvas. If it is archival or not will probably just depend on how well you protect the canvas from hypo contamination.