Changing field type issue

[HeToC]

I've created field within the list with a MultiChoiceFieldDefinition (checkboxes) but then i found out that i need to change it to ChoiceFieldDefinition (radiobuttons).
So changing MultiChoiceFieldDefinition to ChoiceFieldDefinition in code leads to exception "Field or property EditFormat does not exist".

Original code

            var fldState = new MultiChoiceFieldDefinition
            {
                AddFieldOptions = BuiltInAddFieldOptions.AddFieldInternalNameHint,
                Id = new Guid("ef4ae491-5375-4464-b11f-c48514788039"),
                Title = "Sate",
                InternalName = "State",
                Choices = new Collection<string>() {
                                    "State 1",
                                    "State 2",
                                    "State 3"
                                },
                AddToDefaultView = true
            };

After changing to Choice field

            var fldState = new ChoiceFieldDefinition
            {
                AddFieldOptions = BuiltInAddFieldOptions.AddFieldInternalNameHint,
                Id = new Guid("ef4ae491-5375-4464-b11f-c48514788039"),
                Title = "Sate",
                InternalName = "State",
               EditFormat = BuiltInChoiceFormatType.RadioButtons,
                Choices = new Collection<string>() {
                                    "State 1",
                                    "State 2",
                                    "State 3"
                                },
                AddToDefaultView = true
            };

So is there any way to change column behavior from multiselect to choice? or i did it smth wrong ?