So, while waiting for the Mac build of VLinn, I spent much of the day coming across a breakthrough: it is possible to run the standalone version of PC VLinn as a Logic Pro plugin! Haven’t tested with other Mac-based DAW’s due to my budget, but it will likely work for those as well, even if slightly different procedures. It is also worthy to note that this method could work with any standalone VST's, as opposed to just the VLinn.
Here’s how I did it:
Part 1: MIDI (the most difficult part)
1) I installed VLinn on my Mac via WineBottler, as described on Aly James Lab's website: http://www.alyjameslab.com/macosxsupport.html
2) In the Audio MIDI settings of my Mac, I created a MIDI port with the IAC Driver in the MIDI window.
3) In Logic, I set an external instrument track’s MIDI output to the new MIDI port. (IMPORTANT: in the Environment window, it’s important you set the MIDI Physical input sources in the Click and Ports tab to only one device and not the sum, which is default! Otherwise, you will get MIDI feedback if the external MIDI track is record enabled!)
4) In VLinn MIDI settings, set the MIDI input to the same new MIDI port. It might be possible to use other MIDI inputs and outputs and have it still work, but I went on the safe side and used no others. Still, make sure “Pass Through to Output” is Unchecked.
Part 2: Audio
1) Download and install Soundflower.
2) Configure the VLinn’s audio output to Soundflower 64ch. This will definitely be necessary if you wish to use the multiple outputs feature of it.
3) Make sure the audio input channels for the external instrument track in Logic are set to the output channels of Soundflower that you used for VLinn.
And voila! It’s not as convenient as having a single external instrument track, but it still works!