I think 10 hours have passed so here is plan
[X] [Deploy] Write-in: Send half of your units to protect Metropolis while others remain at LexCorp.
-[X]Tell police and SCU to prioritize defending civilians and to help evacuate them toward designated safe zones – Metropolis subway, existing bunkers, heavily protected hospital area and so on. Send 500 LexCorp security forces, 400 armored vehicles along with 1500 spy drones to help coordinate their movement. Freely distribute as many exo-suits as possible.
-[X]Lex, Cassandra, Jinx, Caitlin, Siobhane, Elaine, Rebecca stays to protect LexCorp tower, along with half of your regular troops (half after subtracting forces send to provide evacuation). Other half divided proportionally between hero units you send outside. All blizzard blanket drones stays at LexCorp tower to be deployed at convenient opportunity.
-[X] Send Pamela to help evacuate Daily Planet (only whose who willing) then focus on protecting largest group of civilians. Don't bother too much with Lois. If she wants to run toward danger then let her do it, if you can plausibly forget to evacuate her then even better. If there is opportunity to give interview instruct Pamela to focus on increasing her own reputation. Don't give interview to Lois. Don't bring additional attention to Pamela ties with LexCorp.
-[X] Have Mari, Leonard, Mick and Sam protect hospital area. Give them experimental super-tank. Send Katherine Kane and Jade Crock to New Troy, give Katherine Ravager custom exo-suit. Send Mercy and Edward Well to Bakerline. Have drones and individuals in the invisible man suits scout out which areas have Brainiac's forces most heavily concentrated in. Have Lucy Lane focus on coordinating with Pentagon.
-[X] Send Roxanne and Helena to Star Labs. Make sure that Star Labs technology does not fall into Brainiac hands and protect scientists. Don't bother with protecting equipment, the more material damage Star Labs suffers the better, but make sure not to be too obvious about it.
-[X] Charge Felicity, Nigma and Meena with task of finding ways to circumvent Brainiac communication suppression. Let them use LexCorp supercomputer for this task as they see fit.
I think a token force to at least avoid the issue of being painted as abandoning them, but no hero unit, at least for our initial action. If superman has to keep going back to the daily planet because thats the first place he defends and brainiac quickly discovers the connection between him and Lane,it is a very puplic connection and his goal is info collection, that keeps clark tied up a little and prevents him from stealing the show elsewhere. There's also the chance brainiac focus more attention on it to keep Kalel pinned, which eases the pressure elsewhere in the city.
People are welcome to suggest such plan, but I still think that one hero unit would not affect Superman/Lois dynamic and our favorite reporter would still find danger for herself. And if Pamela run across Superman we will have chance to talk to him and maybe suggest course of actions that benefits us. Pamela is highest level government representative here and in contact with military response (if Lucy manages to contact Pentagon, and then contact Pamela) so either he obeys her or he makes it clear that he don't follows direct orders from government even in the time of national crisis.
Also I would like to suggest a hero unit on the super computer directing the clone or at least ensuring there not hijacked by brainiac.
What clone? If anything can be done with supercomputer I am not averse of putting Felicity on it but I don't remember us controlling anything through it and trying to hack Brainiac is not a great idea so I am not sure what to use it for.