Hi,
Yes, you can use the Badi HRPAD00INFTYBL, but not sure if it is possible for the same infotype with the different subty. we can use it create some other secondary infotypes.
Other way to create another program and find the records where subty 0 and 2 are different and if it find any, then create/modify with the subty '0'. Can schedule background weekly/mothly based on the requirement.