alternative heading syntax

Hello.

Do you mind telling please if there is a way to alternate the way headings
are marked up?

My biggest issues with the current style are that
It is uncomfortable to text search for all heading lines since the syntax
makes them at least 2 lines
and I have to change the size of underline when I change the text.

Would be nice if I could just use some substitution or a directive or a
role.
But I do not seem to find anything sufficient in the documentation.
And I do not want to modify or extend docutils.

Apart from that the specification suits my ideas of beauty and simplicity.

Thank you.

Someone's older discussion.
https://sourceforge.net/p/docutils/mailman/message/30356904/