I’ve given some interesting links to Jigs on the old forums.
But here is a site with a few interesting descriptions.
(half way down they show many different Hutch designs).
These are quite old ideas, alternately known as Hutch, Kieve, Keeve, there is no reason something like this couldn’t be setup on a small scale with a footpump for remote use (& fossicking locations). I’m working on a similar idea.