Underscore/block text cursors in GUI applications.

[rhubarbpieguy at gmail.com]

With Wayland, can/will it be possible to display an underscore/blinking 
underscore or block/blinking block text cursor in GUI applications?  I'm 
not referring to command line terminal windows.  But I do want the text 
cursors of such in GUI applications.

I know little of Wayland, but I wonder is it can intercept the 
right-justified I-beam cursor and display what I want system wide.  I 
want my preferred text cursor in all my applications, browser, 
spreadsheet, word processor ... whatever.

My thinking is to determine the text cursor at the display level in one 
fell swoop instead of addressing the issue by individual application.  
But as I admit, I know little of Wayland.  Can it be done?  If not, is 
there another method?