Do you know maybe when creating new seed in Electrum if by chance I get all words that are BIP39 compatible (without "special" words unique for Electrum word list) can I recreate that seed on BIP39 wallet?
You will definitely get a seed with bip39 words only because that's been the default behaviour of electrum since version 2.0. However it won't be a bip39 seed and you won't be able to restore it in other bip39 wallets. Wallet software has to support electrum seeds for you to be able to restore in it. Blue wallet is one such program that supports it.