I’ve not worked with fancy modern(ized). fighter jets, but if they’re anything like normal planes this stuff is probably not very hard to pull out.

But the closest I’ve gotten to messing around with this stuff is my L39 (terrible idea, should’ve bought a boat instead. wife hates me now), which did indeed come with some soviet era kit screwed on. Came off easily enough after removing a couple of screws.

I’d be surprised if the interesting parts of the radio equipment they’ve screwed onto the old MiGs would take much more than that to remove.

Aviation authority approvals might take months, but I can’t imagine that being an issue for military planes like this.