move from SCVMM 2008 R2 SP1 to VMM 2012 SP1?

Dears,

i have 3 HA Hyper-v Clusters based on Windows 2008 R2 SP1, and managed by SCVMM 2008 R2 SP1, i decided to upgrade to SCVMM 2012 SP1 , i know is unsupported , but i want to try this scenario

1- remove Hyper-V Clusters from SCVMM 2008 R2 SP1 and uninstall agents on the hosts

2-build clean installation of SCVMM 2012 SP1, and then install the agents on the 3 clusters1

3-move manually all files in the old library server to the new library server

4-unistall VMM 2008 R2 SP1

please correct me if i am wrong, and do you think removing host agents from VMM 2008 R2 sp1 will affect Virtual machines or hosts functionality..

thanks

Mufleh