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trouble with battery backup

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I have not actually drawn this out or simulated it but I think that if you were to take 2 PMOS fets, put then source to source, comment in series with the battery, then connect the two gates, pull down to ground and connect to the power input, that might do the trick

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I just wanted to let everyone know, in case any one else runs into this, that I got this working. I removed R23 from the circuit, left D2 as a 1n4148 and replaced D1 with an unknown rectifier that I found in my junk box with a voltage drop of about .168v. I also modified the code to incorporate a power good line to disable scanning if the main power is lost. Works great! Thanks for all y'alls help!

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