MVC 5 / Bind dropdownlist including disabled values - asp.net-mvc-5

Question

(My first quesion, I'm quite impressed :) )
First, please excuse my English, I'm French ;)
My issue is about DropDownList which is linked(bind) to a required field (F, int) of an object O (edited in a view V) and contains a list of elements (LE), some of them disabled.
The behavior I want in the view :
when I create an object, the validation must trigg if nothing
is selected in the list (OK)
when I create an object, the disabled elements of the list must not be selectable (OK)
when I edit an object, if the field is among enabled values, same behavior (OK)
when I edit an object, if the field is among disabled values, it must be displayed and selected when viewed (OK)
when I edit an object, if the field is among disabled values, when I post data, the client validation must authorize disabled values to be validated (OK with a little javascript)
My issue :
when I edit an object, if the field is among disabled values, when I
post data, the model contains null for the field linked to the
dropdownlist even if I include an hidden field with the Id.
Here is some of my code to help understand my issue.
Any idea of how I could include disabled values of my dropdown list in the model when I post data ?
Thanks for any help !
View :
<div class="col-md-3">
#Html.DropDownListFor(model => model.Currency.Id, (SelectList)ViewBag.Currencies, new { #class = "form-control ignore-desactivated" })
#Html.ValidationMessageFor(model => model.Currency, "", new { #class = "text-danger" })
</div>
JS :
$(function () {
$('form').validate().settings.ignore = '.ignore-desactivated';
});
Source when edition :
<div class="col-md-3">
<select class="form-control ignore-desactivated" data-val="true" data-val-number="The field Id must be a number." data-val-required="The Id field is required." id="Currency_Id" name="Currency.Id">
<option value="-1"></option>
<option disabled="disabled" value="9">Angolan kwanza (desactivated)</option>
<option value="10">Argentine peso</option>
<option disabled="disabled" selected="selected" value="1">Euro (desactivated)</option>
<option disabled="disabled" value="56">Gibraltar pound (desactivated)</option>
<option value="3">Great Britain Pound</option>
</select>
<span class="field-validation-valid text-danger" data-valmsg-for="Currency" data-valmsg-[replace][1]="true"></span>
</div>
My model when I want to save data :
https://i.stack.imgur.com/jQ9aH.png

Answer 1

... and I found an answer a few minutes after asking it (thanks to my colleagues)...
I don't know if that's correct, but a little js code to remove disabled items before the post did the trick :
//Delete disabled elements of lists before submit
$('form').submit(function () {
$('.ignore-desactivated').each(function () {
$(this).children().each(function () {
$(this).removeAttr('disabled');
});
})
})