Adding kernel module to LiveUSB

[Hyperspace]

Hey community,
Thanks for stopping by. After searching for hours for a solution, I finally turn to this forum.
I'd like to add a kernel module to the liveUSB genkernel. To be more specific, I need dm-integrity to decrypt a different usb drive I have to access for my gentoo system setup. Since the liveUSB root filesystem the user boots into is basically read-only, with writes being written to the RAM, i have already booted into a different OS in order to mount the gentoo liveusb drive, change a few flags in boot/gentoo-config and rebuild that kernel. But since the liveUSB is written in dd-mode, modifications are impossible.
What is the easiest way to add that module? Will I have to modify the ISO before flashing it onto the usb drive?
Thanks for taking your time helping me out,
Hyperspace
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[NeddySeagoon]

Hyperspace,

Welcome to Gentoo.

The easiest way to add a module to the liveCD kernel is to file a bug at bugs.gentoo.org for Release Engineering to add it.
Then wait for an update.

If all the things that dm-integrity depend on in the kernel are already set, you can build the module elsewhere and put it into the right place in /lib/modules/...
Then insmod it every time. You need the exact kernel sources and exact gcc versions to build a matching module.
That's a pain and doing it that way means that the extra module is not loaded until after boot.

You other options involve recreating the ISO file.

If you have another live system that contains dm-integrity' you can use that system to install instead.
Boot it. Get a root shell, Run

[Hyperspace]