aerobatics training before the ppl is finished is just a rort perpetrated by flying schools.
other rorts include offering formation endorsements.
the belief is that once the licence is issued the school wont see the student again so they milk them for all they are worth.
to the original poster. you arent being smart by wanting this.
get your PPL first. then all that you do is a permanent addon to your basic licence.
the way you are doing it is just frittering money away for nothing.
...but I'm sure you wont be told.