Given the likely vagueries of local power and water I would be going something even more simple internally.
Do not go near a machine with volumetric controls, to many things to go wrong in your situation and generally cant be repaired without parts.
Suggestion of go a Manual fill on the boiler option in case the autofill dies. With one of these generally the only other electrical parts on a simple machine are the element and the pressurestat both of which are very hardy devices.
Depending on the availability of LPG you could consider that to heat the boiler depending on the machine. All you need then is some power for the pump and grinder.
An OK barista will handle 40-60 coffees an hour on a single group machine (providing it will keep up). While I understand the freight issues into countres such as this a domectic machines boiler is really to small to keep up to a crowd. Consider looking at a 5L 1 grp commercial machine and even stripping some parts into a second box to weight share. That is take all the easily removable parts, casing, the complete head, handles etc (likely to be 15-20kg without to much work).