Looking at setting up a scenario for play that has the Falcons launching a Trial against the Wolves for Omni technology. I looked a bit, but I do not have the Golden Century . . . who did the Falcons get Omni tech from when they trialed?
From Clan Coyote in 2863 (FMWC, p41). As a sign of friendship with Clan Wolf, Clan Coyote provided the Wolf Khans with details on the unit that won the Omni technology from the Coyotes which would help the Wolves win the technology from Clan Jade Falcon.
Would the Wolves only have been targeted after they started producing their own Omnis- such as copying the Coyotl originally and then introducing the Woodsman?
Probably immediately after they received the technology. However, in the interest of fairness the ilKhan and the Grand Council decreed that each clan could only forward one challenge per year to the Coyotes. This constraint also applied to other Clans that obtained the technology.
Do you think this would be a binary vs binary fight?
It would vary depending upon the Clan and how much they desired it.
What mechs would be in the Falcon touman to be used before they gained Omni tech?
A mixture of SL designs, Clan refits of SL designs (C variants and first and sometimes second generations of IICs) and post-exodus designs (such as the Thresher, Fire Scorpion, Bane and Supernova). The RATs in ED Golden Century (p21) do provide a list.
I seem to recall that some of the Omni Trials ended up with the only way some Clans gained the tech was as isorla off the battlefield.
Those wouldn't have been part of the Omni Trials but rather separate conflict(s). For example, the Star Adders gained the Omni technology from Clan Mongoose who had acquired the technology before the Adders. Clan Mongoose built a large number of them and then launched them against Clan Star Adder en masse. Sensing their weakness, Clan Coyote would launch their own offensive against the Adders. The Adders would salvage several OmniMechs from both Clans and swiftly develop their own. After fielding three galaxies worth, the Adders would launch a counter-assault that would only end when the Mongoose Khan foolishly asked the Grand Council to intervene, would subsequently be declared unworthy and the Smoke Jaguars would be authorized to absorb them.
Might this scenario work better with Elementals?
Well the Elementals would be developed later and again the Falcons would win the technology early, this time from Clan Wolf. In repayment of Clan Coyote's earlier information, Clan Wolf provided them with information on the Falcon unit that won the Elemental technology from them.
I was sort of thinking the Wolf defending force would be perhaps a few of the new Omnis, a Orion IIC because it would have a prestigious commander, otherwise . . . maybe the Shogun C, Imp C or Firefly C- basically things the Dragoons used
Just use the MUL and limit the intro dates to the timeframe in question. Reminder: All the Clans still fielded SLDF 'Mechs during the Golden Century, but it is up to you whether you want to field them or not.