Dear @crypto.piotr,
For STO's, Polymath would be the right platform. I was not aware of the recent developments in polymath. I would recommend polymath as a first choice platform even if it is difficult to process. Because they will perform all regulatory check before processing these tokens.
If you really find it difficult to pass through you have to do hard work in approvals from local government and do a pre check of all the requirements and you can launch your own token on EOS, Icon or Ethereum.
So far I have given with the view of launching this token, But my personal view is that this tokens will be successful once the governments start regulating the cryptocurrencies. Right now some positive events are taking place in the space. Some 5-7 countries have released positive news in the last month. But the sentiment is really low in this space.
Thank you