Welcome,
I think you can ask,
but I don't think you can expect lots of work unless you give it a try yourself (and don't worry people will happily critic your designs) and having more than 1 design completion open at any time tends to just dilute the work.
Essentially, this would be Germany being allowed to re-arm somewhat earlier than in our timeline due to the Soviets doing better against the Poles in 1920 (basically no Miracle-on-the-Vistula).
Ok my take on this is that you would not need many more ships the Soviets didn't have much in the way of modern stuff so just adding a few more destroyers for Baltic work ?
in OTL limits,
twelve destroyers (not exceeding 800 long tons (810 t)) and twelve torpedo boats (not exceeding 200 long tons (200 t))
So maybe up to 24/36 of each ? should easily deal with any Soviet fleet unless they build a lot more ships.
I think the main point would be they would be allowed more in the way of an army (and maybe CAS aircraft ?)
get the images (in ShipBucket style) to populate some of the graphics of the mod - just to clarify, this would be a non-profit endeavour, with the mod itself freely available to the members of the Darkest Hour community.
Not sure about if this is allowed (would they still be credited ? you should PM Gollevainen to get a answer)