If I wanted to go for the best scenario in my case, I would go to someone like SAF, and ask for 2 bats!
The first bat would be based totally on performance, and as my match bat would need to be the exact weight and pickup I like with good all shot profile.
The second bat would be a lower grade willow. But I would still ask him to do the exact same profile, size of middle, position of middle, same pick up. BUT would see if he could make it a couple if ounces heavier!
That way, I would get use to using a heavier bat in the nets, ensuring that my muscles get stronger in their shots! But as the difference would only be a couple of ounces, I would hopefully not have to correct too much of a timing issue in a match! Especially as my timing is a little slower when I play matches anyway, due to me being not quite as relaxed in matches as I am in nets! And in a match I choose my shots a little more carefully (or try!)
And therefore, the slightly lighter bat in a match should feel a lot lighter and easier to play, and bat speed should be better too. This is obviously a theory, but so far a similar method to this seems to be working well for me. However, it probably won't work for everyone!