Yes. That is correct. Safex coin is an Omni token. As I understand it, if you send them to your Safex wallet, you are using the Bitcoin blockchain. Hence the need for a small Bitcoin fee. The address you can see in the Safex wallet is a Bitcoin address.

I have not tried to send Safex coin from the Safex wallet. I'm planning to Hodl mine. However, you could try importing your Safex private key to Omni wallet. Then send them to your exchange from Omni wallet. I have transfered other Omni assets this way and it worked fine. You do need to be careful when messing with your private keys though.

I'm only a crypto newby and have not sent anything from the Safex wallet. I hope this helps.