Is there a way to vote on a witness when steemit blocks the witnessvote area with the policy wall?

I am not sure, whether we understanc correctly what you mean. Do you have technical problems with voting via Steemit? If yes... there is plenty of ways. Voting is on Steem blockchain, so different interfaces are just a way to make it more accessible to Steem users.

You can vote via steemit:

• https://steemit.com/~witnesses
• via SteemConnect, like links like this: https://steemconnect.com/sign/account-witness-vote?witness=wise-team&approve=1
  • on https://steemian.info/witnesses you can find list of all witnesses with steemconnect voting links next to each witness:
    
• via vessel wallet:
  
• or by executing a raw code written in:
  • python: https://github.com/steemit/devportal-tutorials-py/tree/master/tutorials/22_witness_listing_and_voting#4-vote--unvote-
  • java script: https://github.com/steemit/devportal-tutorials-js/tree/master/tutorials/22_witness_listing_and_voting