redirect specific url for mobile devices - .htaccess

Question

first post here ;-)
My question. How do I redirect mobile visitors, once they view a specific url within my website, to the mobile version of that specific url?
For example a mobile device user visits mydomain.com/thisurl then that url should be redirected only for mobile device users to mydomain/thisurl_mobile.
I have partly some htaccess code that might be a start? But not sure how to do this for a specific url? This is what I have so far (Btw it needs to be https):
<IfModule mod_rewrite.c>
# turn on rewrite engine
RewriteEngine on
# only detect smart phone devices if we are not on mobile site
# to prevent redirect looping
RewriteCond %{QUERY_STRING} !^desktop
# a bunch of smart phone devices
RewriteCond %{HTTP_USER_AGENT} "sony|symbian|nokia|samsung|mobile" [NC,OR]
RewriteCond %{HTTP_USER_AGENT} "windows ce|epoc|opera|mini|nitro" [NC,OR]
RewriteCond %{HTTP_USER_AGENT} "j2me|midp-|cldc-|netfront|mot" [NC,OR]
RewriteCond %{HTTP_USER_AGENT} "up\.browser|up\.link|audiovox" [NC,OR]
RewriteCond %{HTTP_USER_AGENT} "mini|nitro|j2me|midp-|cldc"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "netfront|mot|up\.browser|up\.link"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "audiovox|blackberry|ericsson,"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "panasonic|philips|sanyo|sharp|sie-"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "portalmmm|blazer|avantgo|dange"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "palm|series60|palmsource|pocketpc"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "smartphone|rover|ipaq|au-mic,"[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "alcatel|ericy|vodafone\/|wap1\."[NC,OR]
RewriteCond %{HTTP_USER_AGENT} "wap2\.|iPhone|android"[NC,OR]
# redirect google mobile bot
RewriteCond %{HTTP_USER_AGENT} "googlebot-mobile"[NC]
# if the request is from any one of the above devices
# redirect to mobile url
RewriteRule ^$ https://www.mydomain/thisurl_mobile [L,R=302]
</IfModule>