Playing with a new experimental tool "dilloc" to control #Dillo from the command line via a UNIX socket. Here is a simple example to open the current page in the reader view plugin (in the same tab):
% dilloc open rdrview:$(dilloc url)
The "dilloc url" command prints the current tab url to stdout, which can then be easily manipulated. Here is another example with sed, to redirect the current tab to the old reddit interface:
% dilloc open $(dilloc url | sed 's|www.reddit.com|old.reddit.com|')