Your kit has the markings for <58 as a decal option so there's that. You could probably do something with that... maybe a highly diluted coat of RLM76 over it? My Ta152H had painted over markings too. I used a mask lifted off the model surface with Blu Tack blobs to get the effect.
You could xerox the decal sheet, cut out rough masks for the <58 and use them as paint masks.