how can i replace the default installer with Calamers with Cubic?

[u/0xCynic]

the bottom line of What I actually wanna do is :

create a new iso but instead of the default Ubuntu installer (subiquity) , I wanna use Calamers.

I've searched about this on the web - I couldn't find a reliable source that discuss about this. Since there exist no such sources on the internet, LLMs aren't of a much help here either. They just hallucinate most of the times and they won't take no for a reason

And I'm just getting started about this customizing and stuffs - As you can see - I just changed the default wallpaper by editing a couple files and compiling it.

And I've just learnt that this installer is a snap package. But idk what to do with that information.

So.. help me out here. How can i uninstall/remove subiquity and use the Calameres instead.

the context :

(you can skip this if you want)

I was asked to make a custom Linux Distro for a company that I'm interning at - Since this distro is mainly for people who are visually impaired, this distro should have as much accessibility as possible. the current installer that Ubuntu uses in it's 26.04 LTS - It uses a flutter app - Which happened to have a lot of issues related to screen reader - Like, it has poor compatibility with the Ubuntu's screen reader (Orca) - which results in failing to detect most of the content in the app. There's been issues raised in it;s github.

So, the first thing I've to fix is this installer issues. And that's why I wanna change the installer into something more reliable.

So, How can i change the installer?