I'm sure you've already considered it, but my first thought would be to switch the type of the property in the model to be a boolean.

Otherwise, inside the @code block, maybe you could add a property for the boolean, set it inside OnInitializedAsync based on the value of "Active", and assign the proper value to your "Active" property in the method that fires on a valid submit. If boolean is true, Active = 1, else 0.

The general idea is something like (I haven't tested this):

<EditForm Model="@_myModel" OnValidSubmit="SubmittingForm">
	<InputCheckbox @bind-Value="_active" />
	<button type="submit">Submit</button>
</EditForm>

@code {
	private bool _active { get; set; }
	private MyModel _myModel = new MyModel();
	
	protected override async Task OnInitializedAsync()
	{
		_myModel = await //... get your model data from the controller
		
		if(_myModel.Active == 1)
			_active = true;
		else
			_active = false;
	}
	
	private void SubmittingForm()
	{
		// Set the value of the Active property with the value of _active
		if(_active == true)
			_myModel.Active = 1;
		else
			_myModel.Active = 0;
			
		//continue...
	}
}