Append Special Chars(cyrillic) in edit view

Hello All,
We need to add some simple way to enter special characters like cyrillic codepage

characterd to database fields(We decided to do it the simple way by adding these

in HTML coded form (&#xHexcode) as this makes us independend of PHP and mySQL

version and ISP settings)
What we are looking for is

• Are there any snipplets of code for such an approach?
  
• Is there any simple way to add for example a button('Add Cyrillic') to the edit form
  
  which calls a form acting as cyrillic keyboard submitting back a charnumber to
  
  append to a specific database field (as HTML coding)
  
• Or would it be simpler to create a cyrillic keyboard inside the
  
  edit form and appending the characters via java script?
  Best Regards,
  Christian