I'm not aware of any lists of engines in metric but there are plenty about if you put the work into looking for them
Most of Anthony Mount's designs are metric or dual metric/Imperial
Our own Stew Hard mast have half a dozen metric designs
Julius De Waal muist have close on 100 different engines all in metric, just a shame they are all on the one sheet![smile p smile p](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
Plenty of others to be found in Europe if you don't mind a bit of German, French or Italian.
Failing that its easy enough to convert to imperial or justy make them a bit bigger using 1/32" = 1mm
J