Three Line Break charts

That's a great idea, but I don't see any options on the chart workbench for customizing the look back period. If you like the idea of summarizing price data, though, you should really look at P&F charts, which have good customization possibilities, if you haven't already.

The Chart School articles is an excellent introduction

https://stockcharts.com/school/doku.php?id=chart_school:chart_analysis:pnf_charts

and if you want more the book by Jeremy Du Plessis is probably the most complete and thorough

https://store.stockcharts.com/products/the-definitive-guide-to-point-and-figure-2nd-edition

He has a new one, too, which I haven't read

https://store.stockcharts.com/collections/top-ten-best-sellers/products/21st-century-point-and-figure