BSP Editing without Map Decompiling

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Hello everyone, I'm working on my High Resolution Cubemaps on Source Games and I'm Looking to Edit BSP without Decompiling. as you know, Decompiling isn't 100% Accurate. So is there anyway to Edit BSP Contents (I Only need to change the properties of env_cubemaps.) without Decompiling?
(BTW Not Entspy)
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    There is not. The map has to be decompiled to edit it.
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    Actually there is, a program called EntSpy. It is on valve developer community page but i think the download link is gone :(

    Maybe there's other programs, you just gotta dig
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    access_time 19d edit 19d
    I forgot what it's called, but isn't it relatively common to patch small changes into compiled projects with like a text editor?

    You can open BSPs right up with notepad++ but you'll mostly get [null][null][null][null] tbh
    Not only that, though. If you scroll through it a bit there's plenty objects clear as day

    If you know the exact coordinates I guess you should be able to pinpoint what you're looking for?
    On the other hand;
     Note:This is an internal entity. When the map is compiled by VBSP it is processed and then removed: it does not exist when the map is running.
    so idk but that sounds like you ain't gone find nothing
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