Armored Construction Foam that have more hardness/blast resistance. Way to get is foamed iron bars or iron fences, e.g. it works completely the same as with cables but instead of cables will use iron bars or iron fences as core. It also will be nice if CF sprayer will work with iron bars or iron fences as with wooden scaffolding, e.g. use it's geometry to place foam.
Industrial Dryer/Heat Gun is electric tool that will heat area of CF, not just one, to make it harden faster. It may reduce internal counter of each CF block so it will work not instant like sand. In industrial scale using sand to harden CF is pain.