Hi!
let's begin: is it possible to run 5 bridges on one low-end VPS?
[...]
and would 5 processes be too much for a 2-core VPS with 256mb memory?
I did run a single Relay on a small vps (2 GB VRam 2 Ghz VCore). Tor itself did run smooth but the VPS was unable to manage all the tcp connections. On my VPS those where limited to 360 (!) connections hard limit. So double check you don't have limit on those