Hi H.
I used a Rothenburger 44mm hole saw driven by a 1/4 drive socket and a 600mm extension in my cordless drill.
First job was to centre punch the disc to stop the drill wandering and then its just steady away. Its stainless and quite thick which resulted in wearing out 2 hole cutters even lubricating them with Rocol tapping grease. It took about 15 minutes per pipe.
Using the 44mm cutter also leaves a small shoulder so if you ever wanted to revert back to standard another disc could be inserted and fixed to it.
Personally I won't bother as I like it as it is.
