Row handicaps?

A granular handicap system for Twixt has been implemented for several years now on Game Center, which is a real time server. The smallest handicap is to do away with the swap move. Beyond that, the grid is reduced in the vertical direction. The weaker player moves first as white without swap and has less distance to cross. IMO this is a great way for players of differing strengths to both enjoy a challenge. Here's an 8-row handicap board from the Vassal module.

Any handicap game would be unrated. What do you think?

Sorry I don't know how to add an image.

https://boardgamegeek.com/image/1905966/twixt

I played several games using row handicaps when teaching Twixt, and agree that it works really well. However, I'm not really sure if it would be as useful on LG, as my impression is that unrated games are less common here?

You can directly invite a player, and such games are unrated. But you are right, such games are rare.