Yes, you can fill by hand.
We don’t need to fill page 3 - if your wife will be present during pick up and receiving passport.
Page 4, is debatable, I personally have filled NA, on both the options of Biometrics, but some Have filled the top section of page 4. So, can’t really tell.
Whatever you choose, make sure you submit all 4 pages of consent form, even if you are not filling page 3 and 4.
Just write NA on all the sections that you are leaving empty.
P.S. For biometric thing, I did included the receipt, when my husband went to give the fingerprint a year ago, he insisted on including that, because the VFS guy that time told him to bring that receipt when coming to submit passport. But this thing is not mandatory as it’s not written anywhere.
Since, I was confused in the page 4 options, including the receipt was making sense to me.