no it won't work. Getting your pumps to match the exact GPH will be very hard. Even if you get two identical pumps. One will flow faster than the other because one is working against gravity the other with it. Why not use a PVC overflow?
it will suck air out of input pipe and reestablish the syphon
all you would need to do is a check valve at the top of you input pipe
just like the DIY pics of the pvc overflow
it say it can lift water 30inches
the end of your input pipe in the sump would have to be submerged