Thank-you for the advice! I might just try the NAND gate, shouldn't add that much cost, current draw, etc. Two more questions:
1) If I put a NAND gate chip on my board that has 4 NAND gates but will only be using 1 gate, if I want to save power, should I ground the rest of the unused NAND gate pins or is that a bad idea?
2) The schematic in my first post also suggests a Diode (D1) between the first and second stage. I'm using surface mount parts but couldn't find a ceramic single diode in a 0805 package on Digikey. There are so many choices...RF diodes, zener diodes, etc. I *think* I just want a "normal" ceramic diode in an 0805 package but there are so many choices I'm not sure what to choose. Any advice?