It's not for everyone @3WildOnes but you could always add an application via CAO to the Irish system (TCD, UCD for starters), if he's a high achiever (and your financial circumstances allow it) and run it in parallel to the UCAS process. You lose access to UK Student Finance but the tuition is 3K EUR per year (2K EUR for 3 of the 4 years for my DD due to Irish Government rebates), she is finishing her UG studies this May 26, that included Spanish and Arabic. She starts work after receiving a Returner's offer as a consulting associate for a Big 4. Many of her cohort have also secured a variety of offers and had a mix of internships, placements, Laidlaw scholarships etc along the way.
Accommodation is an issue, but not unsurmountable and still no where near as expensive as say, London. The Y4 cost is £7k for on-campus, but Y1 is a dice roll for sure.
They require a foreign language at GCSE, and depending on degree course, 1 or 2 MFL in the A level mix which then convert into points. If you can add a 4th A level, AS level, EPQ or Further/Core Maths (extra points), even better. The entry threshold is high for UK students to compete against Leaving Certificate points accrual, but at least they still value MFL studies, and the YA is totally funded through Erasmus. This includes at non-EU universities that falls under Partner university funding, with the exception of USA. Lots of JH options, if combining STEM and language is attractive as an example.
It also has its downsides, but if you have an independent YP not requiring huge hand-holding as it's not that environment, then it's possibly another option. And humanities alongside STEM students do not get looked down upon in the same way as here (her anecdotal opinion) - they are all a bright bunch, quite respectful of each other.