Hey now, I wouldn't disregard this project completely just because it's built on web tech. The most popular Bitcoin paper wallet generator is the same way - and using that directly involves your money. Their approach to the "it's not safe" argument is by open-sourcing it and letting people run it locally (bottom right) [1]. Maybe that would work well for this project, too.

That said, it's a nice UI, OP. I wouldn't abandon this because of the lack of response you got here.

[1] https://bitcoinpaperwallet.com/bitcoinpaperwallet/generate-w...