Thank you! Yes, it is some effort, but actually, an "air-gapped computer" can be the same one you're using right now. Air-gapped just means disconnected from the internet. Using a verified version of Tails and then disconnecting the computer from the internet when actually doing the sensitive generation steps should do the job! Of course, ideally you'd do it on a truly separate air-gapped computer, but that's really not necessary, especially for something like 0.25 bitcoin.

Hope you find it useful, now or in the future haha :)