I agree that Iron Cheetah is much more appropriate symbol for reborn Smoke Jaguars than Warhawk which has practically become Goliath Scorpion totem mech at this point
For Jaguars it represents everything that they are trying to change about themselves and leave in the past
For Scorpions OTOH Warhawk represents something completely opposite: it defended them during Wars of Reaving, it protected their new home in Imperio and it carried them to victory in the Crusade
Iron Cheetah definitely can and should be symbol of reborn Smoke Jaguars, it's still absolutely their mech. Fact that other factions use it doesn't change that one bit
Kodiak, Horned Owl, Timber Wolf, Summoner and Kingfisher are used by many factions but they are all definitely still Bear, Scorpion, Wolf, Falcon and Raven mechs respectively
Iron Cheetah can easily be that for reborn Smoke Jaguars, hell it already is by any measure: Jaguars made it, Jaguars use it and Jaguars will be getting more of them in the future
As for Warhawk coming back to the Inner Sphere proper I think it will happen at some point, yes Scorpions are gorging on them now but at some point they will have their fill and send it on the open market like they did with Snow Fox or Star Python
Already high price combined with rarity and distances needed to import one could make it something of a prestige item: not any rando would be able to shell out cash for it and Sea Foxes would be riding that situation for all it's worth
Considering their current employment status Smoke Jaguars should not have problems acquiring fresh Warhawks once they hit the catalogue
About Fidelis, I would bet good money that (regardless of what their political opinions they may have) should anyone even try to touch them they would be starting full blown blood feud with every single Smoke Jaguar out there and that it would end horribly for the perps
It's not a hornet's nest I would recommend disturbing
New Jaguars started well enough but in order to redeem their name properly they first need to prove their worth to population of the planet they will end up living on and in light of recent updates New Earth looks like possible location to start that process