i18n issue - Blocks of tags in a non-displayed language are absent from block admin page

This is partially related to: http://drupal.org/node/202978 and to other i18n issues.

i18n can be set to display only content from a specific language. AFAIK, it does so using db_rewrite_sql().
In tagadelic_block, a block is created for each vocabulary, using taxonomy_get_vocabularies(). Helas, this function also uses db_rewrite_sql() to decide on access permissions, and the result is that when viewing the admin/build/block page, only blocks for vocabularies of the current language are visible.
When submitting the form, the non visible blocks (of other languages) are being disabled. This results in missing blocks each time the blocks are saved.

I have no good solution so far :-(
(I modify the blocks through direct DB query, which is kinda stupid)