Prestashop 1.7 attribute groups - check stock and apply css to unavailable combination - attributes

Question

Prestashop option to hide unavailable attributes on product page doesn't work when attribute groups are used, for example color and size (for clothing shops).
I need to keep showing all possible combinations, but grey out (or strikethrough) the combinations with no stock.
Like this:
I tried several things.
In Prestashop 1.6 the following piece of code worked to apply css class (.out-of-stock-float-left) to unavailable combinations:
{elseif $group.group_type == 'radio'}
<ul id="group_{$id_attribute_group}">
{foreach from=$group.attributes key=id_attribute item=group_attribute}
{if {$group.attributes_quantity[{$id_attribute|intval}]} > 1} <!-- product in stock -->
<li class="input-container float-left">
<input class="input-radio" type="radio" data-product-attribute="{$id_attribute_group}"
name="group[{$id_attribute_group}]"
value="{$id_attribute}"{if $group_attribute.selected} checked="checked"{/if}>
<span class="radio-label">{$group_attribute.name}</span>
</li>
{else} <!-- product out of stock -->
<li class="input-container out-of-stock-float-left">
<input class="input-radio" type="radio" data-product-attribute="{$id_attribute_group}"
name="group[{$id_attribute_group}]"
value="{$id_attribute}"{if $group_attribute.selected} checked="checked"{/if}>
<span class="radio-label">{$group_attribute.name}</span>
</li>
{/if}
{/foreach}
</ul>
{/if}
When changing combinations there is an ajax request. I don't know how to grey out combinations with no stock and make them not clickable.
Thanks