Have a questing system for tri. where you go to proofing grounds from their space to abyss space.
In a nutshell when you enter you have to sit in one of 3 pockets and wait for another capsuleer to show up.
Might have to disable the cloaking and implement shrinking of the bubble in order to avoid exploits. (avoiding fight so other person runs out of time)
Even maybe even use the same filaments. The difference would be from which space you are activating it. Have a mechanic for the tri space chalanger to see if its a good time to activate the filiment or possibly give the ability to go in and out of the empty bubble unless capsuleer pops in, then your ticket to the abyss is used up.
2nd room seems like a good place to switch the encounter to pvp match
the winner gets all 3 gates (3rd room / k space / tri space)
the looser’s capsule gets 3 options (get shot down, go blow yourself up in the shrinking bubble, go through winners gate)
That will make abyssal items even more valued and not as easy to grind.
Would be a good way to introduce a different way of getting triglavian standing if you win the duel.