rust/bitbox02/keystore: remove Bip39Wordlist

diff --git a/src/rust/bitbox02-rust/src/workflow/mnemonic.rs b/src/rust/bitbox02-rust/src/workflow/mnemonic.rs
index 8997950..6ce340f 100644
--- a/src/rust/bitbox02-rust/src/workflow/mnemonic.rs
+++ b/src/rust/bitbox02-rust/src/workflow/mnemonic.rs
@@ -271,13 +271,12 @@ async fn get_12th_18th_word(
     // these.
     loop {
         let choices = lastword_choices(entered_words);
-        let candidates = bitbox02::keystore::get_bip39_wordlist(Some(&choices));
         let word = hal
             .ui()
             .enter_string(
                 &trinary_input_string::Params {
                     title,
-                    wordlist: Some(&candidates),
+                    wordlist: Some(&choices),
                     ..Default::default()
                 },
                 trinary_input_string::CanCancel::Yes,
@@ -320,7 +319,7 @@ pub async fn get(
         .await;
 
     // Provide all bip39 words to restrict the keyboard entry.
-    let bip39_wordlist = bitbox02::keystore::get_bip39_wordlist(None);
+    let bip39_wordlist: Vec<u16> = (0..bitbox02::keystore::BIP39_WORDLIST_LEN).collect();
 
     let mut word_idx: usize = 0;
     let mut entered_words = vec![zeroize::Zeroizing::new(String::new()); num_words];
diff --git a/src/rust/bitbox02/src/keystore.rs b/src/rust/bitbox02/src/keystore.rs
index 02d8281..434e002 100644
--- a/src/rust/bitbox02/src/keystore.rs
+++ b/src/rust/bitbox02/src/keystore.rs
@@ -168,29 +168,6 @@ pub fn get_bip39_word(idx: u16) -> Result<zeroize::Zeroizing<String>, ()> {
     }
 }
 
-/// An opaque C type which gives access to all BIP39 words.
-pub struct Bip39Wordlist(Vec<u16>);
-
-impl Bip39Wordlist {
-    pub fn as_ptr(&self) -> *const u16 {
-        self.0.as_ptr()
-    }
-
-    pub fn len(&self) -> usize {
-        self.0.len()
-    }
-}
-
-/// If indices is None, all BIP39 English words are returned, otherwise only the words of the given
-/// indices in the BIP39 English wordlist.
-pub fn get_bip39_wordlist(indices: Option<&[u16]>) -> Bip39Wordlist {
-    let indices = match indices {
-        Some(indices) => indices.to_vec(),
-        None => (0..BIP39_WORDLIST_LEN).collect(),
-    };
-    Bip39Wordlist(indices)
-}
-
 pub struct SignResult {
     pub signature: [u8; 64],
     pub recid: u8,
diff --git a/src/rust/bitbox02/src/ui/types.rs b/src/rust/bitbox02/src/ui/types.rs
index 5db7ff6..02a460e 100644
--- a/src/rust/bitbox02/src/ui/types.rs
+++ b/src/rust/bitbox02/src/ui/types.rs
@@ -100,8 +100,8 @@ impl<'a> ConfirmParams<'a> {
 pub struct TrinaryInputStringParams<'a> {
     /// The confirmation title of the screen. Max 200 chars, otherwise **panic**.
     pub title: &'a str,
-    /// Currently specialized to the BIP39 wordlist. Can be extended if needed.
-    pub wordlist: Option<&'a crate::keystore::Bip39Wordlist>,
+    /// Currently specialized to the BIP39 wordlist: a list of BIP39 word indices. Can be extended if needed.
+    pub wordlist: Option<&'a [u16]>,
     pub number_input: bool,
     pub hide: bool,
     pub special_chars: bool,