If you're diligent in searching and patient, you will be able to find a complete ivory 302 for around $50. Those always have cracks in the housings, but repairing the ivory ones is not too hard if you are planning on painting them anyways. This gets you a complete, often date-matched base, the 6D or 5J dial, and, which is important for looks, a handset without the grooves along the handle and the clear plastic plungers. Then paint away....
The three cheapest complete 302/304s in that price class that I have obtained cost me $25, $41, and $51, before shipping. So I know they are out there. You need to let them come to you.
I determined that the WECo dark blue (-18), at least on my set, is very close to Sherwin-Williams Regatta blue, SW-6517, and Georgian Bay blue, SW-6509.
I averaged them and obtained a compromise color in RGB 38,82,110, or in HTML hex format #26526E. This is in HSL = 144,124,74.
An NOS set probably has purer blue, but you don't have to match color since you're painting the entire set.
The image below on the left shows a surface area of a blue housing, and some S-W swatches on the right. You can judge what fits best.