How to change the default symbol mapping for variables in OpenWatcom?

Question

https://open-watcom.github.io/open-watcom-v2-wikidocs/cguide.html explains #pragma aux default to specify default symbol name generation. For example:

/* prog.c */
#pragma aux default "__*__"
extern int mysym1;
extern int mysym2(int x);
int mysym3(void) { return mysym2(mysym1); }

Then compile:

$ owcc -c -o prog.obj prog.c
$ wdis prog.obj | grep mysym
0000                            __mysym3__:
000A  A1 00 00 00 00                    mov             eax,_mysym1
000F  E9 00 00 00 00                    jmp             __mysym2__

Please note that mysym1 didn't receive the surrounding double underscores, so it was unaffected by #pragma aux default. How can the default be changed for variables as well?

Please note that #pragma aux mysym1 "__*__" does work for a single variable, but I want to change the default for all of them.