Hmm, if you can copy the files over to another hard drive first that might help minimize your wasted time. I've rsynced the ~/.bitcoin/blocks and ~/.bitcoin/chainstate folders from a separate node so I'm pretty confident you can do that. So copy them back once you've installed/upgraded to 64 bit and it will resume from there.
Regarding installing other services, I'm no authority but might be better for your SSD to wait.
Bitcoin Maston Instance