If the ISP indeed gave you a /30 for the PtP and a subnet for your internal hosts (which it lookeslike they did) you can still use your insde 192 addresses on the inside. Take the 164.65.13.89 255.255.255.252 and assign that to the loopback 0 interface and use that address to NAT to. This way the "world" will see all of your internal IP hosts as 164.65.13.89. Hope that helps.
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