First, What's your end goal here? Is it to not forfeit the RSU's? Is it to not pay the taxes upfront? etc
You ask a lot of "is this normal questions", but it sort of doesn't matter if it's normal if you want something else.
Maybe the answers affect the chances of getting that something else, but it's really hard to give advice without knowing what you actually want to achieve.
It will quickly become a sort of academic discussion.
At the end you say you want to explore "potential solutions" - but can we start with what you want the outcome to be, actually?
Second, you say you want to "engage in a conversation with the company to explore potential solutions". Uh, okay.
Right now you have 30 days. Best case, assuming you don't have to do something before then, notification wise. Do you have meaningful legal representation?
If not, will you go that far, assuming the company offers you absolutely nothing? Or doesn't even bother to respond?
If you don't have lawyers, but are planning on going that far, you don't have a huge amount of time to get them and have them help.
Even if you aren't, you are veering quickly into territory where it sounds like you need more than just a bunch of questions answered by smart people on the internet.
You should strongly consider professional advice here, if for no other reason than the ability to have a live conversation about this.
This isn't idle internet curiosity, it sounds like it actually matters to y'all.