The very best would be if there was a way to just bridge the blockchains like how they did with DOGE on the ETH chain. The disadvantages there are that it requires some technical work, and (at least the DOGE bridge) is kinda expensive to use. The advantage is everything is fully automated and all you have to trust is a smart contract anyone can go look at.
Next best would be if Maidsafe acted as the intermediary and at least hosted a 1 time swap at the start of DEX trading and another 1 time swap when real safe-coin exchange was happening. Disadvantage is I think we already asked them and @dirvine said no thanks, its not worth the cost in time and money to make sure this was all fully legal.
The most realistic option in my mind is we elect some trusted people from this forum to have keys to a multisig for swapping between ETH or TRON blockchains and OMNI. Really there is no barrier to making a token and saying you will swap it for MAID. Anyone can really do it. The issue is trust. That said I would trust some veteran members of this forum to do it.