You can " customize" your existing markings,(for example "highlighting" the scribblings with white, red or whatever color you wish)
But so far as I've read on the boards, alteration (changing, re-doing...) would be a violation of Federal law.
Sure, you could have a 'smith add some Cyrillic but to alter the existing mfg./ importer marks would be a "faux pas" (Please pardon my French..dammit, isn't "pardon" French too??...
)
I'm no expert in this field, so proceed with the thread, but I do know ( ugly as they can be) that import markings aren't to be touched.
From what I've seen, things such as, for example, a Hesse 7.62 AK receiver can be retouched to indicate the proper caliber if you were to build a 5.45 or 5.56 rifle on it.(keep in mind these are American receivers, altering the marking to indicate the proper caliber is justified.>>
Keep in mind though that something of that nature isn't an imported firearm.
If your talking SAR, I wouldn't waste my time worrying about it's ugliness. They're among the ugliest AK's available anywhere in the world... (edit/ dicsclaimer...I own 2 SAR's, one is still in all it's ugly glory, the other was re-done fairly inexpensively. Both have crude engraving (that's almost a compliment...)
Regardless, they're plenty functional. I used some bake-on laquer on one, the other will get Alumihide or engine paint. Just depends on how the bake-on laquer holds up. So far, so good.