Absolutely no need to fear the official softwares. Kobo's are not locked in any way, and you can free install any firmware you want... from all of Kobo's previous versions, (as far back as since your device existed, so you can't really install firmware from before Libra 2 existed.) to completely custom tarballs you make yourself. (not sure if there is any existing maintained projects, but nothing stopping them either.)
The only limitation here is that since the Libra 2 can't be opened and drive removed without some level of destruction to the device, it's at your own risk if you install something that can not boot.
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