Problem

--Is it possible to force AUDIT files swap? if yes how?

Resolution

Yes, you can force that SWAP, via an Interpel command or via a Mvs batch :

1)  console command : MLBSAVE

-> Start save process reorganisation of the MAILBOX and swap of audit files.
     No parameter
    Type : 1, on mailbox server.
    Trace : yes,
    Associated programme : PELMXMSV.

or

2) JCL executing  the program PELBTCMD, with, in sysin, the command MLBSAVE
Example
//STEP01   EXEC PGM=PELBTCMD   
//STEPLIB DD DISP=SHR,DSN=IUSERITP.INTERPEL.LOAD                                  
//PELPARMS DD DISP=SHR,DSN=USERITP.INTERPEL.PARMLIB(ZPARMSRQ)
//SYSPRINT DD SYSOUT=*                                            
//SYSOUT   DD SYSOUT=*                                            
//SYSUDUMP DD SYSOUT=*                                     
//SYSIN    DD *
MLBSAVE
/*