United States
There can potentially be a lot of unique ways to addressing this but you don't have to simply take away shrecks from volks.
When volks do upgrade to shreck make them not able to access flame nade and salvage and give them a second upgrade option(not accessable if you chose shrecks) for a few AI weapons for mp40s and an stg or 2 that give access to salvage and flame nade.
Or something along these lines, this way volks with shrecks are at a distinct disadvantage for AI when they upgrade and have a simple infantry counter.
I like the idea behind this-upgrading volks take away some of their utility. Remove incendiary and salvage, maybe give them a light anti tank grenade that does damage but doesn't snare for some flavor.
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Serrith
Conscript reporting
Relic Entertainment
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Heartless Jäger 
