Can the expression "could I" be used as in the examples below to refer to a hypothetical situation, or about something that would be desired but is not possible? As far as I know, the correct or safest option would be to use "If I could" but I would like to know if this alternative would also be possible.
Coud I sing like her I wouldn't be working 40 hours a week in this clothing factory.
Could I talk to her at least one more time, I'm sure I would convince her that everything I did was because I wanted the best for her.