If you have any mechanical apitude, drilling the ends of the cracks shouldn't be too difficult.
If I may recommend a few things I have learned, Check with a j.ewelers loop before the repair to see as best as possible as to where the crack really ends, then proceed as follows:
1. Use an awl to punch a small dent in the cymbal for the drill bit.
2. I use an 1/8" bit and try to make the outer edge of the hole end a fraction before the crack.
3. Use a slow speed and a little oil on the spot where you are drilling and have a steady surface such as wood underneath the cymbal.
4. After drilling I use a very small round file to smooth it all out.
5. When playing the cymbal after repair, don't use a felt and nut to hold down the cymbal, let it breathe and move freely
Check the area every so often to make sure all cracks are not spreading, or new ones developed.
I have 2 Paiste 602 pre-serial with cracks that have been drilled out, and I play them like every other cymbal.
Good Luck!