Maybe if mikrotik NATing in transparent bridge mode?
Mikrotik has no ip address on out and on in interface. Passing
traffic through mikrotik with the Core to the border router NAT.
And the real ip addresses are not Nating and left ip Nating.
Accurate, such a scheme works with other equipment.
How it is useful?
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The purpose of such a network are real and not real ip address , not the real ip addresses on the LAN should work without NAT , and only when they have to exit the Internet tension . Real ip address not go without any translation. Eudemon Firewall from Huawei performs this task. It works for me in the active link . But in Mikrotika that that does not work.
Let’s say that the interface looks at 1 locale and 2 on the 'Net . Create bridge1 and include interfaces to bridge1 . Real ip addresses passing through bridge1 should not take place without any change , and not the real address 192.168.55.0/24 Nating on a range of ip addresses (69.69.69.0/28).