Hi MaccaNZ;
Welcome to the forum.
I haven't used these or have tried anything like this. There have been several members in the past that have tried something similar that they had jerry rigged, using either pellets, woodchips, sawdust, or even solid wood pucks. No one reported any or very little success. Keep in mind that the bisquette burner produces temperatures between 450°F to almost 600°F, and the generator cycles every 20 minutes. So that may not be enough time for the saver to heat up for the wood to begin to smolder.
These may work since they have some mass, and will conduct more heat; but you should wait until this product gets a lot more written reviews. The reviews seem sketchy. Very few are written reviews for the 5 and 4 star ratings, and the 3 to 1 star ratings are not that good.