Today I've tried a method I read yesterday and it seems to be working fine with Elastix 2.2.
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I've changed something in the little process described there, instead of shutting down the VM when asking for the installation source in step 3, I just unchecked the checkbox that says "Start the new VM automatically" just before the installation is started. When the creation of the VM has finished proceed with the step 4.
Note: If I set this new machine with more than one vCPU I start getting a lot of messages about a soft lockup on CPU1, since my installation is relatively small (about 12 concurrent calls) I removed one CPU and there are no more messages like this so far