You can swap BTC for XMR on our service within a few minutes.
No one is going to trust a centralized swapping service that not only takes a fee for an altcoin exchange but additionally is operated by someone of your status.
The OP clearly said he is not going first if you are not trusted. Sending money to your service is the equivalent of sending money first and hoping for money back next.
If OP finds the people he is looked for, then he will do 1 : 1 with them and not face any fee like what he will face when using your service, other than the network fee to send the BTC.
I'm not against proposing solutions to services when they are applicable, however this advertisement is not applicable as it does not meet the requirements stated in the OP.