As I understood you correctly you just want to rename 'kkpo_quote' and you have conflict. Not to have conflict try to replace all 'kkpo_quote' with same name, for example:
if you replace
'kkpo_quote' with 'new_quote' in register_setting(KKPLUGINOPTIONS_ID.'_options', 'new_quote'); then make sure that you replace it with 'new_quote' where ever is 'kkpo_quote' There is 7 times apearing in that tutorial 'kkpo_quote'
