You might want to try getting in direct contact with some developer and ask them if they are available, e.g. Coldtrick (https://www.coldtrick.com/) or Arck (https://www.arckinteractive.com).
I think you can see this https://elgg.org/discussion/view/2998091/redesign-the-elgg-community-theme
and contact https://elgg.org/profile/rjcalifornia. I am not sure but you can give a try. Thanks.
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