Google Sharon Schambers. She has a video where you can use boards to roll up the quilt. She used it for basting but it may work for pinning as well. If you can contact a local quilt quild they usually have someone who has a frame that your quilt could be put on. Maybe some of the ladies will help. Nice chance to meet other quilters.
Having a large table like at a senior center or library. Even some churches have social halls where you can put more than one table together helps.