Bitttymacod
The problem I see with the proposed solutions is that they represent the possibility of harassment in the opposite direction. Guild A declares on Psykopla Knoll (q50). They bring 3 people since Guild B (who currently owns it) only has 3 active members. Since Guild A is Kami, the Kara Alliance (or whatever) brings 30, beats Guild A's team into a pulp and then reports Guild A for harassment.
Why a guild with only 3 active members hold an OP ?
If you are not ready to fight/wait to keep your OP just give it to someone else in your faction.