You can pump papercrete with a peristaltic pump made for concrete. They are fairly inexpensive to build yourself. Here is a brief video of mine. The one in this video cost me about $2500 to build and I sell these for $5500 to the local concrete guys. The ones from Monolithic cost about $10k and have more features than mine. There is also a Benron pump for $8500 that will work as well. The benron pumps are nice and have feed control at the gun too.
My pump:
https://www.youtube.com/watch?v=x5_tyWnrqxw
Monolithic pump:
https://www.youtube.com/watch?v=TUsRPPjSfpk
Benron Pump:
https://www.youtube.com/watch?v=1J3wl5VgLPk
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