Powerpoint creation (Remote support) for consulting managment project

The situation:
I'm strategic planning consultant. I develop a strategic plans for businesses in different industries. I submit my deliverable in PowerPoint, Word, and Excel format.




My engagement start from one month to four months depend on the project scope. Besides, I get several project on-going at the same time.

Usually, i sketch my desired outcome using (Pen and paper) before start working on the laptop (PowerPoint). This help me have a clear picture on what I want to do on powerpoint. However..


..

The complication:
I do not have the time to create the PowerPoint slides (Drawing the slide to write the text). 

The slide nature:
1) a structured slide with "Objects" more than "images". The pictures is illustrative only for specific idea.



2) It includes management related slides ( Gantt chart, FlowChart, Process flow, Activity cycle, etc.)
3) It may include Financial chart (bar chart, histogram, etc.) However it is not my priority. This can be handle by my team.
4) All is in editable format so my client can use the slide when i handover the project.