Before you try anything, go into the BitLocker Management utility and use the function to both print and back off the key. You will need this information later.
I have used Macrium Reflect to clone lots of installs and my suspicion is that it will work because it does not actually read the files or folders; instead, it copies the sectors. So, even if the data is encrypted, it will still copy the individual sectors.
So, if this were mine, after doing the BitLocker backup stuff I mentioned above, I would download and install Macrium Reflect, connect the SSD, and see if the cloning works. The software is free, so it will not cost you to try it -- other than the cost of the SSD.
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