Hi, the only way you would get around it would be to set a range rather than a wildcard with *'s. You won't be able to set a range in IPSEC in group policy, the only way you can get around it would be to us NETSH and add it into a local startup script. It would need to look something like this,
netsh ipsec static add filter filterlist="RDP in" srcaddr=Any dstaddr=69.92.34.81 description="RDP 3389" protocol=TCP mirrored=yes srcmask=0.0.0.0 dstmask=255.255.255.248 srcport=0 dstport=3389
Take a look at a netsh command guide here which should help you along the way -
http://www.colorconsole.de/cmd/en/Windows_7/netsh/ipsec/dynamic/show/rule.htmM@