@anneliesgeraets I’m between conference calls right now, so I won’t be able to respond in detail, but…
Within the past two days, I saw another post on this subject (dual language sites), and one of the respondents said he/she had successfully completed such a site with only one issue – there can be only one hamburger menu per site.
I haven’t had time since then to check that out, but it may be the case (I’ve never done a dual-menu site, so I haven’t personally dealt with this).
So…
First, it might be worthwhile to ask the Editor X team if this is the case and if they can suggest a workaround. As a possible workaround (and I haven’t thought this through), it might be possible to build alternative menus as lightboxes.
If I get free later today, I’ll try to take a look at this.