This is totally unresearched, but my gut says it would be much higher ROI for Europe + North America to independently source solar from their respective nearby deserts, paired with batteries?
This is already in the works and secured financing recently. It’s a smaller link but it’s a start. Also Tunisia trade electricity with Libya and Algeria; so technically they could be selling electricity to Europe through that link.
Alas during the previous Trump presidency, Europe saw that modern Republican 'America First' thinking doesn't just call for a wall with Mexico, a travel ban with Muslim countries, and a trade war with China - it also wants a trade war with Europe.
And linking the south of Spain to the north of Morocco only needs ~200km of undersea cable, rather than the ~6000km an EU-to-US link would call for. That's a pretty big benefit.