Because 6.34rc42 requires Winbox 3.4 I've created an OSX version of Winbox 3.4 with WineBottler.
It's available here : https://storage.googleapis.com/aicial-m ... nstall.tgz (64MB file)
Note - It is not signed - you will need to allow it permission to run. It is a clean install of 3.4, but you have to take my word for it. It would be far better for Mikrotik to take the 5 minutes themselves to do this and release an "official" version, but I'm not going to hold my breath.
Open the archive - move the winbox.app file to Applications - and that's all you should need to do.
Please let me know if you have any issues, I've tested on the few machines I have access to - but all except one already had Wine on them, so I've not been able to test many use cases.