This is the article of law which lists the category of KITAS holder that could be entitled to be issued a KITAP. They are:
b.) rare foreign expert
c.) top foreign manager of a company
d.) foreign churchmen carrying religious duties
e.) foreign spouse joining an Indonesian husband or wife
f.) legitimate child who holds a foreign passport joining an Indonesian parent
g.) foreign spouse of a foreigner holding a KITAP
h.) legitimate unmarried foreign child (under 18 y.o) joining a foreign father/mother who is a KITAP holder.
i.) Former Indonesian willing to regain Indonesian citizenship as per Citizenship law number 12/2006
j.) Retired foreigner*
If your KITAS doesn't belong to any of these category, then you can not apply for a KITAP. Being a foreign expert is not enough as you can see. In your case, if you are not part of the top management, you will certainly have to wait until you stop working and that your Indonesian wife sponspors you for a KITAS (without having the right to work then). Then after 2 years, you will be able to apply for a KITAP.
However, belonging to one of the above categories is not enough... If you read the (3), it says that the change of status (from ITAS to ITAP) must consider the benefits that this foreigner brings to the nation in terms of national development and must consider the human aspects. This is for the very least highly subjective, and apart for the one belonging to the categories c.), d.), e.), f.), g.), h.) and i.) it may well remain a demand without automatic approbation.
If your change of status is accepted, you will receive a KITAP which allows you to remain in indonesia for 5 years... that's worth the hassles.
*definition of "retired" is given in Keputusan Menteri nomor M.04-IZ.01.02 Tahun 1998 tentang Pemberian Visa dan Izin Keimigrasian Bagi Wisatawan Lanjut Usia Mancanegara