The same Klinger Statite* gasket paper (cellulose fibre based) I've had for a long time, I bought a selection of small sheets in six sizes from 6 thou to 63 thou years ago. The size I used for the induction & feather valve assemblies for this engine was 6 thou, some later engines use a thicker size and towards the end they changed to using an 'O' ring seal (no paper gaskets).
*The smaller sizes of Statite seem to have been discontinued, Flexoid also have the same type of gasket paper in the UK, similar gasket paper should be available from other companies depending where you are.
I have an industrial punch kit that also has a compass based cutter, it came from a business clearance company on ePay years ago for a third of the usual price, I suspect a lot more clearance stuff will appear later in the year from companies that are struggling at the moment.
It got used again the other day to cut some more air filter foam, there is a point that can be fitted to the centre for locating the punches if you use two sizes that fit in the same place on the tool.
The Olfa cutter looks a better choice if you only have a few engines.
David