That's a very good question about delegations...
I don't think there is I'm afraid!
I'll have a dig around and get back to you when I find it!
On the witnesses - I suggest you drop into the Hive discord - https://discord.com/channels/689265414714163208/689891885434929174
And just ask the question in general chat - @crimsonclad hangs out in there and she runs one of the T20 witnesses - @followbtcnews