updating / maintaining bootstrap web design with LESS mixins

updating / maintaining bootstrap web design with LESS mixins

Is it possible to maintain/update bootstrap with LESS like so:
Imagine earlier version, for this example 2.3.2, it includes classes like
span4, span12, etc. I would have custom-bootstrap.less like so:
.myown4columnclass {
.span4;
}
Then, the new version comes along, 3.0.0 I'd like to change
custom-bootstrap.less to:
.myown4columnclass {
.col-md-4;
}