There are numerous issues with compression. It is doesn’t have the energy density does like propane. The compression for CNG and propane is extremely high and without special compressors with the proper seals it leaks, and can start a fire or explosion. I have seen some people do it on youtube video’s with an air compressor but doesn’t end up to be worth the effort. They were getting like 15-20 minutes of runtime with a 100gal propane tank on small generator.
I would try gary gilmores simplefire on your lawnmower to kind of get the hang of things. I would get Wayne’s book, there is a lot of useful information in it, If you are going to chunk stuff up at a jobsite. It would work, if you are going to use your current chipper, it just isn’t designed for chips.
The other option is to buy/make something like Thrive Energy Systerm gasifier which is built more for wood chips, And it has central heat and power. (all power labs GEK is similar) Then wait for or build your own electrified/hybrid vehicles. (I believe by 2020, chevy and ford will have something for light trucks.) There are some aftermarket hybrid kits as well. I get it has an extremely high upfront cost and may seem unobtainable right now, but I don’t believe that will always be the case.
As always it depends on your knowledge and skillset what will work best for you.