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I believe You can do it, if Db is also required the you can change the cluster parameter and start the DB an stand alone.
you can turn off the RAC feature from the oracle binary using
cd $ORACLE_HOME/rdbms/lib make -f ins_rdbms.mk rac_off ioracle
Could work, also I never done this by myself. Few thing to think of:
1. disable crs from starting
2. what about asm? listeners? you need to start it manually by sqlplus and lsnrctl
3. hostname change? reflect the change in listener/tnsnames/sqlnet. Possibly running the cloning script will help.
Should work... just make sure you change the host name/ip address. Then you disable the CRS and start the database. Also make sure you modify anything related to network listener.ora, tnsnames.ora and init.ora (remote_listener, local_listener).