That seems like a horribly extended chain of events just to get it.
Run mission to get currency 1.
Doff mission to trade currency 1 for currency 2.
Trade currency 2 for pet.
Run missions with pet to age/evolve.
Track what stage various efforts are in, so you are eventually doing all of them.
When a simple 15/20 minute STF can get 90 marks, and the process just to get 400 romulan marks can take a month....sad.
Well the idea with Epohh tagging is that it takes awhile to "prime the pump" so to speak, but once it starts flowing, it flows quickly.
And of course there are no STFs for Romulan Rep, so it's pointless to compare the rates of return in that way.
Apart from Epohh Farming the best/easiest/quickest way to get marks is to run the two daily space missions in Tae Dewa sector, and if you can, turn them in during a Reputation event (bumps the rewards for sector patrol from 60 to 75, for example).
The bottom line is that New Romulus is a much slower and less rewarding rep compared to Omega, and always will be unless/until they put in Borg style STFs for nice rewards.