Curiosity got the better of me, and I found an online demo of the web interface on the Draytek website.
It looks like a comprehensive set of functionality. I wouldn’t be surprised if there was some redirect possible using the Firewall → Filter Setup or possibly somewhere in the NAT sections. Unfortunately the demo is static and doesn’t let me go much deeper than the initial landing page for each function so I’m not 100% sure there. You mentioned Layer 2 in another thread, and VLAN tagging is in the demo (under LAN)… just having a click through the demo, it seems like the Vigor 2927 is very full featured.
You may not need to go down the OpenWRT, etc. route until you’re ready to replace the router anyway, as the router you already have may do enough for your use case. There’s also the option of spinning up something in a VM or on separate hardware as discussed above, and playing with things in your own homelab subnet rather than potentially changing something on your production router and annoying the rest of the household.