No more than a very small bridge height adjustment can change the feel of bends. You might agree that having the string resting higher from the frets makes bends a bit easier to hang on to. The restoring force (toward the string's resting position) is up into your fingertip a bit more, so it should be less likely to slip out of your grip. Say you added forward bow and lowered the bridge to maintain action height at the last fret--you could expect to have a slightly better grip on bends in the middle of the
neck since it's further from the string. I wouldn't recommend trying to adjust the truss rod to make the difference perceivable. Just find the right amount of bow to keep notes at the lowest frets from buzzing excessively, and use bridge height to change the overall action.
Unless you have a backbowed neck and the string's touching frets behind where you're fretting/reinforcing a bend, there's nothing else about having slightly more/less bow that will change the force required to push the string out of line to bend a certain amount.
