Unfortunately no, doing so would still end up installing beta 14 (but with the beta 13 skeleton, which is mostly identical)
One solution is to do the following:
After those steps, you are at the same place you would have been after the
When you want to update to beta 14 later, you need to edit
composer.json and replace
"flarum/core": "0.1.0-beta.13" with
"flarum/core": "^0.1.0", then follow the official upgrade guide.