Hi,
Its OK to have CM on multiple OS in DP MOM.
I was recently added Linux CM to my Windows CM+MOM.
I didnt check HP-UX though. But it should work.
Import the DP cell managers to MOM.
Configure CMMDB if you want centralized Media mgmt.
Refer Admin/Concepts guide.
Check IDB consistency before and after the operation.
omnidbutil -extendinfo
omnidbutil -info
omnidbcheck -media_consistency
omnidbcheck -bf
omnidbcheck -dc