“EU officials have warned that this will mean signing up to Brussels rules and the European Court of Justice (ECJ), which may put at least the spirit of Labour’s red lines under pressure in the eyes of Leave backers.”
So what? Just do it.
Step 1 in rejoining.
“a Starmer government looks likely to come under pressure internally to take up the EU’s offer on youth mobility”
Again, just do it. Get on with it.
https://inews.co.uk/news/politics/europe-rebuffs-starmers-advances-on-new-brexit-deal-3085454