meta_query custom DB / any solution?

reference: meta_query with MB Custom Tables

I need to loop (ordered and field-selected) through a custom database with Oxygen page builder.
So there is no other way as to use a meta_query!
You are offering “MB Custom Table” but as far as I understood no way to order such a table with meta_query.

The referenced post is dated Feb 2018.
Your comment was:
“I’m not sure about this, because the way WordPress build SQL queries from meta query object is very complicated. I’ll see if I can do something.”

Was there any change within the roughly 2 years?
If no implementation was possible: Is there any workaround on how to implement the first SQL request in a meta_query?

Query:

$args = array(
        'post_type'   => 'square',
        'meta_key'    => 'sq_text_order',
        // not meta-value-num, as it is a text field
        'orderby' => 'meta_value',
        'order'   => 'ASC',
        'meta_query'  => array(
            array(
                'key' =>   'sq_select_squarematrix',
                'value' => 'Home',
                'compare' =>   '=' 
                )
            )
        )
);

or:
post_type=square&meta_key=sq_text_order&orderby=meta_value&order=ASC&meta_query%5B0%5D%5Bkey%5D=sq_select_squarematrix&meta_query%5B0%5D%5Bvalue%5D=Home&meta_query%5B0%5D%5Bcompare%5D==