Your screenshot doesn't work. 
There are groups of code pages containing ANSI, OEM, ISO
What I need is some genial idea how to show it to users.

Maybe better is what does Total Commander in it's viewer:
(viz https://ctrlv.cz/shots/2017/02/20/3nl7.png )

1. Separate menu item

2. Basic set:
ANSI
OEM
UTF-8
UTF-8 (BOM)
UTF-16LE
UTF16-BE
------------
other code pages as you can see on image

with possibility to add own code pages it should be enough to cover all needs.

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