I've done something similar to this, but use it to get into the web interface of the upstream ISP router/modem/whatever acts as the internet gateway for the MX/Z3 devices at our remote branches. At the remote site: SD-WAN & Traffic Shaping -> Local Internet Breakout -> Create a rule that excludes TCP 80 (or TCP 443, or both) destined for 192.168.1.75 (or whatever the FritzBox's DHCP address is). Then, remote into a workstation/server at the remote site - we use this as a proxy to connect to HTTP(S)://192.168.1.75. The host-specific (or subnet-specific) VPN Exclusion rule makes sure that the traffic targeting 192.168.1.75 on whatever ports we defined doesn't get wrapped up in the AutoVPN and dead-ended at your core.
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