Didn't your router come with a 1/4 inch collet as well as 1/2 inch? If not, consider the 1/4 collet a long-term investment, not just something you need for your dovetail jig. You'll find lots of the smaller bits are hard to locate in 1/2 inch shank.
This entire hobby is one big snowball. Everything you bring home somehow leads to another purchase. I see no end in sight. If you wanna dance, you gotta pay the fiddler.
We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore. - Mark Twain