Thank you guys for the links and the suggestions!
I had actually already done one set of keycaps before and I unfortunately did not get the results I had hoped for. I had mixed iDye Poly blue with yellow and let it sit for 15 minutes at around 80C approx, and I ended up with a forest green type of color. I did not have the smarts to test out a few keys at a time for the optimal results, but I went ahead and bought a new set of blanks to try again.
This time around I will:
-Make the dye solution in a separate container (like the link had suggested) and pour it in to the actual pot of water to get my final concentration. I will try this method this time because my attempt had given me some keys with splotchy dark spots of color and unevenness.
-Test the shades I get with different amounts of soaking time to find the exact shade I want
-Use a more diluted concentration because the author of the post provided in the link believed it would result in a more even color
-Try a few different color combinations
-Be more patient
Wish me luck!