I was reading about leg vises, and found out several sources mentioning that a leg vise (as well as other vises) should have a small amount of built-in toe-in, so that the top of the vise contacts the workpiece first.

Benchcrafted, who manufactures a commercial parallel guide for leg vises (as well as vise hardware), explains toe-in in their blog post: http://benchcrafted.blogspot.com/2015/03/what-is-toe-in.html
According to them, toe-in is somehow built in the Crisscross (their parallel guide) design.

I also found this workbench build log: http://kesterhouse.com/etct/bench.html
He says "the leg vise screw base needs to be installed so the threaded rod has a very slight angle up as it exits the bench leg".
I don't quite understand it, to me it seems it would provide the opposite of toe-in.

Paul Sellers talks about toe-in too: https://paulsellers.com/2018/08/vise-toe-in-out/
Paul says that if a particular vise doesn't have toe-in, it can be retrofitted by simply planing the vise jaw, removing more material at it's bottom.

Most of the workbench build logs and videos (and Chris Schwarz's book) don't mention anything about toe-in or how to achieve it.

I still can't decide what kind of parallel guide to use for my upcoming workbench/leg vise built.

The most low-tech solution, but seemingly effective and reliable, seems to be using a foot-operated wedge (with a corresponding slope in the bottom of the vise chop). The other tried-and-true option is the parallel guide with rows of holes and a pin. I've also seen a ratcheting foot-operated guide, and read about (but can't find at the moment) a second screw in the bottom, with a foot-operated "handle". These options provide either infinitely variable, or "stepped" adjustment which would allow toe-in.

However, the convenience of "automatic" parallel guide which doesn't require adjustment, appears very attractive. I've also read many people saying that once they have used a bench with a St. Peter's Cross/Croix St. Pierre/Crisscross guide, they can't imagine going back to the pin-style parallel guide. I've found out about a couple of styles of automatic parallel guide besides the cross. One option uses a heavy-duty chain and a couple of sprockets. Derek Cohen wrote an article about this one. The chain doesn't really appeal to me, feels a bit over-engineered and looks too gadget-y to have something like that on a woodworking bench. Another design uses a guide rod in a linear bearing. Multiple people who tried that one, couldn't get it to work well (besides, the parts are rather expensive).

So I'm thinking about either going with one of the "manual" options, or a handmade cross-style guide. Here's a quite nice video on making a cross-style guide: https://www.youtube.com/watch?v=yaDZlUIkpgU
The question is, how do I make one that is "designed with toe-in"?

Other recommendations/advice?

Gene