Branch management

[littlesincanada]

Hi Devs,
It's a long time since I pushed any Lilypond dev work to my dev branch 
dev/rlittle. About 9 years to be precise. :o
OK, time that situation changed.

The only commit on that branch is a first pass at a Braille output 
option base. Things have moved on and I'm working on it some more, but 
the base on which it is based is soooo old. So old in fact that I can no 
longer build it. It seems that the build tools themselves have moved on.

On the face of it, a rebase is the obvious solution, but I'm told that 
it's a cardinal sin to rebase commits that have already been pushed.

So what I figure I need to do is revert the changes and apply an update 
that is current with master (which I have done locally, and it compiles 
and runs), taking into account how things have moved on but that still 
leaves my branch anchored 9 years into the past.

Any ideas how I should proceed?

Cheers,
Ralph