What about a 23ga pin nailer? They have a surprisingly strong hold for such a small fastener, do not have the larger head that brad nails have, and the nail gun can be picked up for $25 at Harbor Freight with a 1" max fastener. There are other manufacturers, that cost significantly more, that will drive up to 2" pins.
https://www.harborfreight.com/23-gauge-pin-air-nailer-68022.html