Using holesaw on corrugated roofing sheet

[Llegs]

I have developed a new way to install daylight powered bottle lamps for use in dwellings in impoverished parts of the world. If you search on "Liter of Light" you will see the normal installation process which is long winded, relatively costly and requires a reasonable amount of skill in metal working as well as a range of tools.

My method relies on a bespoke hole cutting device using a standard holesaw but should be capable of allowing many lights to be installed. It also has the advantage that no power tools are required.

The problem I have is that the current hole saw has 5 teeth per inch which means it snags when cutting the downward section of the 2mm thick roofing material and the saw has to be turned in an anti clockwise direction basically wearing it's way through the roof.

What would really help is a holesaw with 10tpi. I have searched the net and could purchase the saw I require ie  102mm dia 10tpi if I lived in the USA, Germany, Australia or New Zealand but not the UK.

Does anyone know where I can buy such a holesaw 

I have tried attaching a photo of the cutting device but it is larger than the 500kB limit. 

thanks for any advice you may have