Okay, I have an idea which could work. This may take some explaining, so bear with me. First, have the B-29 perked at 200. Have it with two setup options, one normal and the other for a nuke. If the nuke option is picked, there is only one base per country from which it can launch and an added 5000 perk cost. Even if the mission is a success, the 5000 perks are lost. Each country only has two of these per map.
Everything in a 6k radius is destroyed with no repair. If it is a base, it can not be taken or used. If it is HQ or factories, it can not be repaired. If there are any friendly in the blast range, kill shoot it in effect.
I can see it now, at the start of a new map, every country has a massive HQ raid to take it out. Or a fight to take out the one field the nuke can be launched from. Look out furball!!!!
NOW, MAYBE, WE CAN SEE THE END OF THIS SUBJECT.
Is everybody happy?