Cisco ASA – Allowing No-NAT Public Subnets

Unfortunately from the Configuring Network Object NAT documentation for 8.4 it states

You can only define a single NAT rule for a given object; if you want to configure multiple NAT rules for an object, you need to create multiple objects with different names that specify the same IP address, for example, object network obj-10.10.10.1-01, object network obj-10.10.10.1-02, and so on.

So you will have to create multiple objects with the same host just different names.

Without the use of same-security, traffic will not flow between interfaces at the same security level. That's the way it's designed, and the very purpose of those commands. No amount of ACLs can override that basic function. Once inter-interface/intra-interface is enabled -- thus allowing traffic at all -- ACLs will apply.

(You could set interfaces to different levels and use NAT/ACLs to control the traffic, but your restrictions don't allow that either. And it's a mess to maintain.)