I spend a lot of time out in the middle of nowhere. I carry plugs and an air compressor to make fast work of punctures. The way I see it, use the best plug you can use to get back home. If you feel uncomfortable with the plug, then go get the tire repaired. There are few tire repair centers in the middle of the National Forest, and I have to be self-sufficient.
In the thousands of miles of backcountry driving, I have not had a flat that required repair. In the tens of thousands of miles of motorcycling off-road I have had a lot of flats. On my BMW GS, I have used a number of plugs for its tubeless tires. The Safety Seal plug has proved to indeed be a permanent repair. Other brands of plugs leaked and required further repair.
Here is another popular option:
http://www.stopngo.com/Contents/1075.htm
Or better description about its use:
<
http://www.zenreich.com/ZenWeb/motorcycle/stopngo.htm>