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@Raketemensch
As the spacing's not 120 the dropouts are probably forward facing, if this is the case you can't use 'normal' track chaintugs, right?
I squeezed my 126 dropouts to fit a 120 hub with no problem, they just spring back to the original spacing once you take the wheel out (in case you were worrying about doing anything irreversible). I'm fairly certain you'll be able to run a hub 2mm smaller than your dropouts with no problems at all (or 2mm larger for that matter, but inserting the wheel might not be as easy, and I haven't dont this personally).
Go for it, you aren't going to find a 128mm hub in a hurry unless you space it out yourself (or maybe ask Gromada if they wouldn't mind doing this for you)