I have a black Epi and a monogram - both size 27. I bought them both preloved from Japan so they both had the sticky pocket issue. I followed the advice in the ‘rescue club’ to use unscented baby wipes to remove the sticky lining back to the base cotton underneath. It’s a messy job (have a bag handy to throw the wipes into and perhaps wear latex gloves) but very simple and effective. Both pockets on both bags are now useable as I removed all of the stickiness. A word of warning, it’s a lot easier on the Epi than on the monogram. I bought the Epi first and it was so easy I got a bit carried away with the mono - I have darkened the outside corner vachetta slightly while doing the external pocket.
let us know how you get on! If you do a search for Trocadero on the ‘bags in action’ thread, I’m sure you’ll come across a few including mine.