Yes this video....(this is instead of swiss ball)
You don't need wall planche push ups...Because you are not in the line in whole ROM. It would be a better to do it with elastic band...
Normaly there is not a problem in pus ups strength but in planche strength.
So my advice would be:
1. do planche leans
2. russian dips and MUs
3. to do planche push ups with elastic band (leg together)
4. do ordinary planchees
5. once a week ordinary planche push ups