NAT Loopback

Hi,

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We are hosting a server that is accessible via its external ip address (lets same 200.16.254.20). Now, my boss wants to be able to access this server internally (say 10.20.0.254) via its external address. He wants to use NAT Loopback

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I sort of don't want to do this if I can propose a different method as I know it can create a lot of overhead for the router. The reason for this is that a program was coded using the external IP address and now can't be changed (would have been fine if used DNS names lol)

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Is there a way we can get round using NAT Loopback?

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Thanks