I did a bit of looking, and it looks like that fund is also used for projects in non-EU member states. Further, if the UK has been paying into the fund, directly or indirectly, it would make sense for them to explore ways to get funding for their own projects before or even immediately after withdrawing from the EU, especially considering that the fund is already used in non-member states.
I still doubt that fund would pay up, as my gut feeling says that in the event of UK leaving the customs union (current stated goal), then it would make more sense to divert shipping around the UK rather than use the UK as a bridge between two shipping ports for faster RoI-Continent transit.
But that’s just speculation on my part, I don’t know the rules by which it operates.
