"you could have just gone and got some rit dye"
Inkjet dyes are specifically designed to be mixable to produce an extremely wide range of colours. They also bind extremely well to wood as they are they are designed to be used on paper. Unlike fabric dyes, they are also extremely dense, so only a microscopic amount is needed. Plus, I already had some.

"it as will craze like buggery specially when you start getting a few coats in"

Well it won't because I'm not using lacquer; I use an oil/wax finish.
Not only is lacquer much harder to apply, unless you're extremely good at it, generally all you're going to wind up with is something that still looks like a cheapo Chinese knock-off bought in a music store.

I tested the inkjet dyes thoroughly on pieces ordinary wood using the wax finish. Three months down the track, no sign of problems. But I do have some clear lacquer so I can soon try that out to see if you're right. The amount of dye needed is so small that I can't see that it could possibly make any difference. Also, fabric dyes contain a lot of other substances apart from the dye itself.