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Thanks @JWestland and @hamrack , will explore options, if I can't remove I'll re-install as it is, feels smooth enough, only wanted to clean and refit nicely the eccentric insert, will not be able to tension timing chain otherwise as it was bit far from irreversible chemical seizing... I feel it might be a threadless bottom bracket though, but can't find online anything looking similar.
It may be worth having a look on SJS cycles...some bottom brackets need special tools and they may have them.
They may have a new BB too if you're stuck. Hard to find small parts are generally on there :)