@Liz.Lightning: Very nice. I did a quick test starting the proxy via ./bitcoin-bip324-proxy -network signet -v2-only and using Bitcoin Core to do a signet IBD (with a patch initiating connections to the proxy, similar to the slides). Worked without any problems. 
Will take a deeper look soon, also curious about the code, so far I have only one point for feedback: I think the port 38333 as default for the proxy is not a good choice, as it’s also the default listening port for signet. I’d go for something that is distinct and doesn’t collide with anything existing (e.g. I chose 1324 for the Python bip324-proxy).