Good news, according to
KaKtoR it seems CIUv2 already works with my new splitter, it just requires the use of Records.ini.
Here's how to use Records.ini in case you don't know:
Types: Split, Freearc_Split, Freearc_Original
Split: Splitted archive part
Freearc_Split: Indicator for merging
Freearc_Original: Original archive, without split/merge function.
Code:
[Record1]
Type=Split
Source={src}\Data1_1(3).bin
Output={app}\Data1.bin
Disk=1
[Record2]
Type=Split
Source={src}\Data1_2(3).bin
Output={app}\Data1.bin
Disk=2
[Record3]
Type=Split
Source={src}\Data1_3(3).bin
Output={app}\Data1.bin
Disk=3
[Record4]
Type=Freearc_Split
Source={app}\Data1.bin
Output={app}
Disk=3
[Record5]
Type=Freearc_Original
Source={src}\Data2.bin
Output={app}
Disk=3
So basically, if I got it correctly, to have CIUv2 merge the files at the end of setup you need to have records.ini set-up and using the
Freearc_Split type to tell the CIUv2 which archive includes the split files, it should be able to handle it.
Please let me know if it really works or if there's any problems.