Emon?
It’s a limitation of the Atmel '328P processor, it has two interrupt inputs, and one is committed to the radio.
However, it is possible to have a pulse input (or two) on a Raspberry Pi, the details are here:
Directly connecting to Optical Pulse Counter with RPi? - #2 by pb66 but it doesn’t appear to be physically possible to add those connections to an emonPi without modifying the case.
So I think the question becomes: do you need the analogue current and voltage inputs of the emonPi as well as the pulse inputs? You will if you have your own generation, because pulse outputs tend not to work (or worse, work wrongly) when exporting. But as you don’t mention that, you might get all the information you need from the pulses.