This is an interesting question and kudos for wanting to give your child such a head start in languages.
Most long-term successfull cases I know rely on different persons speaking different languages. Some examples:
- Two parents with different native languages, each using their language with the children.
- One parent using a learned language only.
- Grandparents using their native (non-local) language, lots of interaction/meetings/invonvement neccessary.
- One language spoken at home, different from the language spoken at the place of residence.
Whatever language you choose, try to have teachers who speak well. The child can only learn the language as well as it hears it. A few decades back here in Germany we had a lot of children (second generation immigrants) who ended up knowing neither language well. Also note that to generate results you have to commit to "active bilingualism" long term, that means ideally for years.
But please do not try to do this all by yourself, especially the "kitchen = language 1 / bedroom = language 2" idea. Not because you might confuse your child, but because you will confuse yourself. While I don't doubt that you may be a very intelligent person, I know first hand what restless nights and constant vigilliance over ever-active toddlers (aka "parenthood") can do to a brain. This approach would IMHO be likely to fail.