Doing sa'ee on a wheelchair

1. Zaid is unable to do 7 circuits Sai of Safa Marwa walking in one go due to sickness (arthritis) but is able to do half a circuit or one circuit daily. Is there any penalty if Zaid does 7 circuits of Sai in one go sitting on a wheelchair?

2. In the above situation Zaid did complete Sai of Safa Marwa sitting on a wheelchair last year is there any penalty?

3. If penalty is compulsory and Zaid goes for Umrah again this year, does Qadha of the Sai of Safa Marwa, will the penalty fall off?