we have the same problem, i live in an apartment building and also have those restrictions, my antenna farm is at the fire escape and i have to color them flat red red so it wont be easily seen from the ground, still can be seen if you look carefully but if your just passing by and at night time, it virtually invisible.
satellite and moon bouncing is on the hobby part of ham radio, just another way to propagate that signal. for disaster coordinating purposes, you just need a good transceiver and a good antenna.
to cover distances like Manila and Samar, HF is the way to go, VHF will be a bit more of a challenge unless your in a high location with not much obstruction to line of sight, stacked antennas and high power outputs. satellite and moon bouncing can help with that.
Theres a motto here in New York/New Jersey area, “when the phones are down, the Hams are up”.
Most of the Hams here (not all) are volunteers for ARES, Amateur Radio Emergency Response, in case of emergency, it can easily be tapped to help and coordinate.
SDR is becoming popular as well, small and light, programmable by computer, its the next generation, but it kinda still rely on computer and internet. internet needs phone service, if the phone service is down, it will be very limited (i think) (what do i know) (i’m an old dog that can’t really learn new tricks)
Just be careful on acquiring those vintage sets, it’s like buying a second hand car, try to know the history and what that particular rig have thru.