Salam
I came across the following dua for the first ten days of Dhul Hijjah that a Meccan scholar from 100 years ago presented in his work and highlighted as something to be recited if unable to read all of the different azkar for these ten days.
It is related from the Prophet (God bless him and give him peace) as collected by Imam Tabarani that he said,
Whoever recites in the ten days of Dhul Hijjah ten times
La Ilaha Illalahu adada duhuri
La ilaha illalahu adada amwajil buhuri
La ilaha illalahu adada-nabati wa-shajari
La ilaha illalahu adadal qatri wal matari
La ilaha illalahu adada lamhil uyun
La ilaha illalahu khayrun mimma yajmaun
La ilaha illalahu min yawmina hadha ila yawmi yunfakhu fissuri
Will be forgiven for their previous and future sins
Reference Kanz al-Najah wal-Surur
Abd al-Hamid Quds al-Makki al-Shafi
Teacher in the Sacred Mosque in Mecca d.1335.