Edit: TLDR: you can get the digital base game and the Pirates DLC on the Korean PSN store, which works to earn the trophies.
I had been trying to get the Pirates DLC for months and had heard rumours of a US disc release with the content but could not track down that particular unicorn. So what I ended up doing was researching on the PSN store sites for other regions and what I found was most Asian countries had the Pirates DLC but the base game came up as Disc Only on the store. The only reliable import of the disc I could find was Japan, but their LBP servers were closed years ago. The only exception I could find was on the Korean store that had both the Disney DLC (as I shall probably do this for LBP2 and the Muppets) AND the base game digitally.
In the end I got a Korean PSN account and 50,000won credit, logged into the account and purchased the digital game and DLC. When it downloaded and updated etc I booted it up on my main account (LEGOMii) and completed the first 3 levels to access the world globe and hey presto; the Pirates DLC was in My Content. You can look at my profile; I started earning the Pirates DLC a couple days ago (30/08/2020)
I am UK based with a UK PSN account.
I did not need a VPN for Korea to download/upload anything.
This worked as of 30/08/2020; I cannot take responsibility if you attempt this and get regional issues or the Korean servers are taken down (a la Japan; which was my first attempt at this because an imported disc is way way cheaper). This is why I did the online trophies (upload level and play 20 community levels) asap, because the rest can in theory be done offline.
Good luck if you decide to try it