there's a old concept for Royal Canadian Navy bid, that they would place additional VLS on the front, where the second 76mm gun currently are. but i reckon it only good for additional 16 more VLS.
You may as well check price of the CSC project and It is actually Team 31 led by Babcock preparing those designs for UK and Canada,
Which in this case it is OMT on table with Indonesia. For the given price which covers IP rights, production and some items i don't expect an heavy modification.
it's hard to assume until the mockup comes out , especially with the indonesia variants are expected not needing that big ass space for SMART-L long range radar , we can still daydreaming with anykind of setup , don't know yet if our navy or SOE still wanting to go with their 144 meter plan or go with original sovaernet 138 meter specification .
i wonder what module under that half penetrating MK56 VLS that prevent mk41 VLS to be fitted , or it's just the denmark navy preference , if there's still much room under the section of MK56 VLS , for MK41 to able fit in , it's better to go with full 8x6 (48) mk41 VLS setup
It will be less likely to expand VLS closer to the shells. If i am aware it is usually avoided and it is preferred to keep VLS as centric as possible.
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@AlphaMike has told A-position can be used for 16 Cells but it is going to require some heavier modifications for 32 cells.
Also in my opinion it is best to go for dual CIWS since Indonesian variant is going to lack Sea Ceptor and MICA does not provide a protection for the very inner layer of self defense. It is more comparable to ESSM in point defense.
I would really opt for a better sensor instead of loading the ship with +32 cells and conducting a heavier modification. Later Indonesia can elongate the hull and work on such modifications for +32 Cells in future class of the ships.
32 Cells means $40-60M to be spared for each ship from scratch, just for missiles. I would spend that extra budger for a better sensor suite consisting of IRST, Dual Radar (X-S band of C-X band combination) or 4-face AESA.
By the way this is my personal view, i am always in favor of a decent self-defense and sensor + ES/W capabilities before than number of the VLS cells.