@khasaab just wanted to add the same approach which @wroos had pointed out, which you say did not work for a numerical name. I wanted to get back to this topic as it could benefit our community.
In the survey tab of your xlsform:
In the choices tab of your xlsform:
Data entry screen as seen in Enketo:
Reference xlsform:
Preset Multiple_Select.xlsx (12.2 KB)