LESS to SCSS will come in Plone 6, currently available as baceloneta branch we also will change all backend templates of Plone to be bootstrap 4/5 compatible, which makes it easier to use bootstrap based themes with standard Plone.
If you want to create a barceloneta theme you can also use the plonecli with the theme_barceloneta template. This will create a theme which contains the barceloneta sources too and you can customize and reuse what you need of it. In later Plone version you will also have the possibillity to just use barceloneta and add some custom CSS in the theming control panel. Much like the good old custom.css it will override all other CSS if you have to. This way you avoid to have a copy of barceloneta just because you want to do some minor changes.
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