Well there are many security solutions out there and there is no way for me to include them all. Of course I encourage people to personalize their car security. My cars are secured and there isn't much more I can do and have it be worthwhile, except of course gps tracking (which I hope to include in the site someday if I can find a sponsor).
I don't like the idea of removing the ECU for several reasons. For one, it's just not practical. You're not going to undo/redo four 10mm bolts and pry out those harnesses every time you park. You're also not going to carry that ECU around with you. If you do, then the ECU itself becomes prone to theft; also shock/heat damage or you may simply misplace it. Second, virtually any Civic ECU will run any Civic engine from the same OBD generation. For example, a 92 DX ECU will run any OBD1 D or even B series engine (92-95)! Sure it will throw codes, run poorly, and not engage VTEC, but I don't think a thief will find that to be a problem. My third concern is that you will damage the pins and plug connectors from frequent and repeated removal.
Detachable steering wheels are not effective car security. I have seen too many threads on various forums where people have reported their car being stolen and they list a detachable steering wheel as part of their security. They are a great visual deterrent for opportunist thieves, but hardly an obstacle for anyone else. Most Honda steering wheels are interchangeable, and you also have the option of driving the car with a pair of vice grips. If it were a cheaper option, and not so clumsy to carry a steering wheel around with you, I might consider recommending it. But as it stands I believe that the money could be much better spent elsewhere.
BTW, I just conjured this image of you waiting in line at a movie theater with an ECU under one arm and a steering wheel in the other!
Thank you for the comments.