Wordpress Addon

1. Site template : I use newsmag4, a site to display news
2. Site got 10 internal post-template, if I choose a template in backend, it modify a key with template value to use
ex. : KEY : td_post_theme_settings VALUE : 'a:1:{s:16:"td_post_template";s:17:"single_template_6";}'
3. How can I to to create different shortcodes to get "single_template_6" if I choose this in front-end ?

Site in backend have 10 post template, and I would like to get these template with a frontend shortcode to do this :

Apply to key : td_post_theme_settings the value implement with shortcode.
Example : if base value = 'a:1:{s:16:"td_post_template";s:17:"single_template_6";}'
If a user click button 1
template 1 I need value became 'a:1:{s:16:"td_post_template";s:17:"single_template_1";}'
If a user click button 2
template 2 I need value became 'a:1:{s:16:"td_post_template";s:17:"single_template_2";}'
If a user click button 3
template 3 I need value became 'a:1:{s:16:"td_post_template";s:17:"single_template_3";}'
and 4, 5 ect
$100 maxi