A new update dropped for Uno yesterday which has added PlayLink support, allowing local multiplayer using mobile devices.
Trophies seem to still be obtainable, by the host, using PlayLink. I have been trying for a long time to get the Flying Higher trophy, with little success, however using PlayLink I was able to get it in a matter of minutes. I can’t confirm that this will work for all trophies and certainly not the ones that specifically state “online”, but I hope this is useful information to someone.