AsalamuAlaykum Warahmatullahi Wabarakatuh,
Jazakillah khair Faizah,
Good question Snakey,
I think that is permissable as it is in the Sunnah of the prophet (Salallahu Alayhi Wassalam) the above dealt with phrases that people made up or things that were from our pious predecessors but not Muhammed (Salallahu Alayhi Wassalam)
Heres the hadith by the way:
"Whoever glorifies Allah at the end of every Salah 33 times (Subhanallah), and praises Allah 33 times (Alhamdulillah), and utters the word of Greatness33 times, (Allahu Akbar) that is ninety nine, then completes it with one hundred, saying: `Laa ilaha illallah wahdahu laa sharika lahuu lahul Mulk wa lahul hamd wa huwa `alaa kulli shay in qadeer, his shortcomings will be forgiven, even if it is as large as the froth of the sea." (Muslim)