There is a caveat, however: Because you choose the FP Ella option doesn't mean you actually have to use the FP to kill the station.
If you select to attack Ella but destroy it with conventional weapons instead of flashpaking it, you still have the FP available for the Vesuvius, later.
You can. It's how I beat the game the first time. The thought of going after the Vesuvius with conventional weapons was unappealing to me (buying into the in-universe description of it being nearly invulnerable, and using the FP on the inside the only way to kill it), and taking a page from Brave Sir Robin (bravely running away) at Ella was similarly unappealing.I seem to recall that you can take the flashpak along, destroy the station via other means, and keep the flashpak for the Vesuvius...
There must have been a seminar that year on "do the ends justify the means" cause that seems to be the main philosophical question posed by WC4 and Ultima 8 (both worked during the same timeframe, or close to it)