I couldn't tell a tattoo artist to pass on a knife and buy more tattoo supplies so I can't tell you to buy more tools and skip the tat.
To me, its one artist supporting another artist.
If, God forbid, you could never make another knife, you'd have it as a reminder of when you could. Not a bad memory in my book.
Post pics when its done.
BTW, I don't have any tattoos, and I wasn't real happy about my wife getting one. When she told me what she wanted, and that she wanted my design, I was flattered to say the least. I'm almost 40 and thinking of getting my first.
Must be a mid-life crisis thing (for me anyway).