Yes it's possible. Don't use Contao's internal style sheet generator.
I for one include my CSS in layout "Additional <head> tags". With an additional trick I load a combined file if I'm not logged in as admin. Therefore I only have this line in "Additional <head> tags".
Code:
{{file::inc_load-resources.html5}}
This file has to be in /system/templates/
You also can use "External style sheets" in layout, then you have to activate the debug mode to see the original files in FE if you are logged in as admin.
You also can try the extension theme plus to achieve better resource handling.
https://contao.org/extension-list/view/theme_plus.html
https://github.com/netzmacht/contao-theme-plus/releases
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