I'm not 100% sure I understand your question. You provided a /25 (128 addresses) on top of a /30 for client peering? The /30 interface would not use proxy-arp, in this case, you would just route the /25 via the /30 interface (using BGP/static, etc). If the client is NAT'ing the public /25 to internal addresses, they would just configure static-nat/destination-nat like normal without the need for proxy-arp.
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