I've been searching in vain for years to find the full names of many Belgian fighter pilots. I have a list of Belgian RAF pilots that shows given names, as well as date of birth, only for those with the last names beginning in A to G. Also those who were killed during the war are found in the CWGC website. The only one of these on your list is:
Sans, Marcel Adrien (rather than "M.J.") (138840) KIA 7 June 1944
https://www.cwgc.org/find-war-dead/c...marcel-adrien/
"Braggard, J." is Bragard, Jean Henri Fernand (1424828)
The service number for J. G. Moureau is 1289855
Apparently it is J.C.I. Van Molkot (rather than" Melkot") (serv. no. 1814824)
Regards,
Tom