... unsponsored 2 month visa turned out to be non extendable, right?...
If you refer to the single entry 60 days C1 Tourist Visa/Visit Stay Permit , it is extendable (see below) .
I'd go for the Silver Hair visa if I trusted the system...
What do you mean by "trusted the system" and/or are you afraid of something ?
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As you will come to Indonesia many times per year , your best option may be a (1 , 2 , or 5 years) multi-entry Tourist Visa , 60 days each entry (may be extended - need to confirm with Immigration) .
Other option : 30 days (extendable for 30 days more) Visa-on-Arrival/VOA , cost Rp500k .
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From
https://evisa.imigrasi.go.id/web/visa-selection
Single entry Tourist Visa/Visit Stay Permit C1
Stay : Up to 60 Days (Extendable up to 180 days)
Cost : IDR 1,000,000
......
You
can extend this Visit Stay Permit
or convert it into another stay permit.
......
Requirements :
1. Personal bank statement with minimum amount USD $2000 or equivalent the last 3 months period (including name, date of period, and balance account).
......
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Silver Hair Visa/KITAS E33E
Stay : Up to 5 Years (Extendable)
Cost : IDR 13,000,000 . Poster's Note : cost of Visa + KITAS + Re-Entry Permit
Requirements :
1. Statement of commitment that the applicant will deposit funds in an account in his/her own name worth at least US$50,000 in an Indonesian Government's bank.
2. Proof of income or benefits with a minimum value of US$3,000 per month.
......
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Multiple entry Tourist Visa/Visit Stay Permit D1 (1 Year, 2 and 5 Years)
Stay Up to 60 Days per entry (#)
(#) Poster's Note : it is not stated as extendable , but I think it is - see Regulation below
Cost : Rp3 million , Rp5 million , or Rp10 million , respectively .
......
Requirements :
1. Proof of living expenses of at least US$ 2,000 or equivalent.
2. Any of the following documents:
Information, invitations, or correspondence from government agencies or private institutions that Explain the relationship with the Applicant, or
Statement letter from the spouse or parents explaining the family relationship with the applicant and the activities to be carried out in Indonesia, attached with a family card / similar document.
......
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PerMen no.11 Year 2024 - free translation
Article 95
(1) Extensions of a Visit Stay Permit may be granted to:
a. Foreigners holding a Visit Stay Permit originating from a single-entry Visit Visa;
b. Foreigners holding a Visit Stay Permit originating from a multiple-entry Visit Visa; and
.....
(3) Extensions of Visit Stay Permits as referred to in paragraph (1) letters a and
b are granted for a maximum period of 60 days each time, calculated from the expiry date of the Visit Stay Permit, provided that the total length of Stay Permits is no more than 180 days.
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60 days Visit Stay Permit's extension : Rp1 million (Immigration fee)