Immigration

I'm a foreigner and working as a GM at a food production factory, have Category B work permit.

Another local factory producing E-trikes asks me to occasionally translate for their RU/UA/EN clients (meetings/exhibitions).

I want to help them legally — but keep my current permit unchanged.

❓ Question: Is there ANY legal way to do occasional translation, can make secondment or short-term permit for another company without changing my work permit? Or probably two companies can sign a contract agreement about cooperation together?

If not — what's the simplest compliant option?

Thanks,