You should be just fine with the brass valve. I have one in our TT for a spare when our plastic one fails. The brass/aluminum galvanic compatibility is way down the scale, so you will be good with it. Many members have done the same switch.
If you're going to "regret it in the morning", sleep until noon.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley