Filling Gum Veins

I'm in the process of building a tool chest in some very old Red Gum. Not so old it's "Ancient" or anything like that, but I think it was milled a few decades ago so the timber itself is old.

As is often the case with eucalypts, there are some considerable gum veins. I would like to minimize wasted timber, but I also want it to still, to some degree, have the veins.

So I'm hoping to fill the veins with something in an effort to stabilize and embellish them. In an ideal world, whatever I use would meet the following criteria:

1. Relatively easy to apply and without making a horrible, toxic mess
2. Dries and cures to a hard, black finish at a reasonable rate at ambient moisture and temperature
3. Doesn't require a tremendous investment in extremely specialized tools
4. Planes or scrapes (or, I guess, sands...) without destroying my tools
5. Bonds to the wood with longevity and durability
6. Takes an oil and wax finish

So I'm open to suggestions on what people have used to do this kind of thing. If there's no good answer I can always cut around the veins. I have nearly a ton of the stuff.

Thanks a lot in advance,
Luke