If it is really useful for you to have this tool, I can try to upload it and set it on one of my domains.
edit:
https://btckeygen.com/ is online again
Of course it is useful, do you know of any other way/ tool, where you could generate any bit of key space with a single tap/ click? This tool is one of the most useful crypto tools in the world. Most of the things I have learned about cryptography is because of this 16×16 grid. Thanks for the offer though.