I’m sure you must be talking about the 12G “standard” spokes here. I don’t have any spokes to weigh…but given the dimensions of a 14G SS spoke and its density, plus the weight of nipples, totals about 382g for a 36 spoke wheel by my calculations. For a 48 spoke, I get about 510g, which means about a 127g difference between 36 and 48.
UDC UK says the Airfoil weighs 1232g, while unisk8r claims they are in the 1300g range. This new Coker alu rim is 1170g, meaning a difference of only about 62g.
Overall then, lightening the rim and adding twelve spokes results in an increase in weight of about 60g.
Sounds like so far the best way to lighten the rim and still have 36 spoke holes is to drill your airfoil like unisk8r has. He’s gotten it down to almost 1000g, much lighter than Coker’s rim.