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Hey Sanjay ;)

Even though I shared this already with you in person, for future reference:

https://desludging.org/ (simple septic tank sludge pump developed by Oxfam in Indonesia)

Have not tried it myself, so no direct endorsement, but it seems reasonably good for relatively liquid septic-tank sludge (as others have noted, most other manual pumps are designed for much more difficult pit-latrine contents).

However this really does not solve the issue of how to transport and where to dispose, and given the high water-tables around here (Leyte, Philippines) a simple drying and percolation trench seems like an unsuitable approach.

Normally I would construct a planted sludge drying bed with a sealed bottom and a secondary effluent treatment system, but this is really out of the scope of our current project.