That should be possible by checking the LDAP server IP and the VPN community settings. All traffic to the remote site on SMBs goes thru the VPN tunnel, in WebGUI we only can exclude admin access traffic to the gateway by the Advanced Setting > VPN Site to Site global settings - Override 'Route all traffic to remote VPN site' configuration for admin access to the device. Or, you can use a special configuration file, see Locally managed SMBs vpn_table.def file.
Strange is that you are using this 1470 like a 770 - using central management would make it easy to exclude services from VPN, also enable the second processor core and even give you logs with names ...
CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist