Your plan will fail.
Voting to send more liberals to the convention will not improve the chances of the convention picking a conservative.
The convention will be run by the party. The party has the delegates, who are committed to the various winners only for a few votes, and then can vote as the party sees fit.
SO unless you think the party is likely to pick a more conservative candidate than the guy you are voting for, the outcome will be bad.
And the more votes people give to the people they hate, the more the party will look at those people and say “hey, he had a lot of votes, let’s pick him”.
I’m not sure who the party would pick, but I’m guessing someone like Tom Ridge, or Bill Owens. Not those people particulary, but that kind of candidate, a good establishment candidate, someone unlikely to have rocked the boat.
Go ahead and make your plans and vote however you want. But don’t think it’s going to work.
My optimism would not be high — but I really see no other option. I would be very, very surprised to find myself voting in November.