I am curious, what has the data you are collecting from your users tell you about the percentage of people that still use W7? I am genuinely interested, can you provide numbers?
And by all means, if your company is in such a state that is in need of my funding, I would be happy to assist you in any way I can. Yes, please do provide the contacts, but for both the financing and for technical departments, I would be interested to discuss with them about the details of this situation.
If you really think Windows 10 and 11 are secure OSs and you feel safe with them, well, good luck with that. And if your software is such a construct that you cannot ensure safety and speed without breaking compatibility, it is THEN that I am really worried about about it's safety. To me it is seems the real reason for the whole thing is your selection of Python as a core language and that's what is dragging you to such decisions. I might be mistaken of course, as I only do software engineering as a side job and I am not an expert.
As I said, luckily, there are other slicers out there that do a fine job. I am quite sure you couldn't care less about how I or others feel or what we do about it, but perhaps if you start loosing users, you might start listening.