Be aware, stainless steel screws in aluminum are generally bad juju. Galvanic corrosion is the problem.
Not likely a problem in this cosmetic use but it can lead to failures. Seen the stainless screws totally sieze in aluminum where the were impossible to remove.
Shouldn't be a problem here but a bit of anti-sieze doesn't hurt.
Buchanan Wheel will make up just about any spoke
Not a bad idea to do the full set and relace the entire wheel.