It has been suggested at the drone panel that there should be a way to easily deploy an opendronemap machine in the field. This could be in tbe form of a small computer with enough RAM with a USB live image with WebODM pre-installed.
I'm in the process of incorporating WebODM with POSM for offline use (and intend to include cluster-awareness so that supplemental machines can be provisioned with node-odm).
see superposm and posm-aux in https://github.com/posm/posm-build/tree/master/live
and the releases link
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see
superposmandposm-auxin https://github.com/posm/posm-build/tree/master/liveand the releases link