Would you use your Google credentials to login to your favorite Steem apps?
Short answer, no.
It is not comfortable for me to unnessasarily use steemconnect to log into any dApp.
It seems to me that no keys need be exchanged if a polling page could signal some JavaScript on the browser to scrape and calculate the votes in the comments (which would need to use some kind of convention like #vote1, #vote2 or something) and then display the current poll results in a Qt window.
Sharing my crypto activity with Google would be my last desperate solution. 😎
P.S. Thinking further it could be run as a cgi on a site which the page could link to and have the cgi scrape the page and pop up a survey window.