As of June 2016, OMNI was laying down ground support for integration with Trezor.
In Oct 2016 MAID support was one of the ideas at a Trezor-sponsored hackathon.
More recently in August 2017, someone leaked footage of what appears to be support for OMNI on Trezor, but I have no idea if this is reliable.
I hope Trezor integrates support for OMNI/MAID soon. If they do, I think many more people will be willing to invest in and hodl MAID. I also think it would be great for laying the ground work for MAID to Safecoin conversion in the future (I.e., Trezor would be incentivized to support Safecoin), much like if you held BTC on Trezor, you automatically got BCH and BTG. That would also help to address concerns over “what’s the point in supporting MAID if it’s just going to go away when SAFE launches” too, I think.