Or we could just offer the shotgun up with no modifications.
As for the biplane, more than one stallion would be pushing things as we only have one or two places to puch such a weapon at this moment.
Also, no offering the Smasher to the soviets, they are like arstotzkans, only bigger and nastier (And more likely to be dealt with by the other great powers)
We could really really use the expense credit and it doesn't hurt us at all to offer. We aren't spending any more actions on the smasher and it keeps the arstotzkans from getting by default if they think to offer their giant lumbering steam tanks, which for all their other failures can be very intimidating to ignorant infantry.
We could offer up the shotgun as is, sure, but as is it's a two shot breech loader which isn't very impressive. Unlike the Sub-Machine Gun though, it's not Expensive, so if we can get it to pump action without making it more costy it becomes the kind of close range weapon you can hand out squad deep, and we could really use some better trench fighting in the plains and another edge in the jungle.
(And the arstotzkans already have more resources then us anyway, if they get the expense credit we might end up very screwed. It doesn't matter if they have shit planes if they can make ten of them for each one we have, and I'd really prefer not coming up against 'cheap enough to hand out to entire squads' type sub machine guns. Or, hell, if they slapped in on the AS-T15 their steam tank suddenly hits 'mass production' cheapness, and even though it's a sucky tank we really really don't need to loose even more grounds in the plains from a sudden giant tank rush.)