Honestly, while I don't have any particular objections to this, I also don't really see that it has all that much of a point in unmodded Starsector; there aren't any modular hulls, at least not that are available to the player, and about the only ships I can think of off the top of my head that might actually want to use something like this are Conquest and Odyssey, possibly Fury and Eradicator, and
maybe Heron - but all of those already have Omni shields, all but Conquest have big enough shield arcs that Front Shield Conversion will cover pretty much anything you want to cover and isn't going to be much if any worse in general than a variant of it which can be configured to move the center of the shield away from the bow of the ship, and of these only Eradicator is all that likely to actually want to engage anything like a peer opponent without its shields up while boom-and-zoom is unnecessary when punching down.
What's wrong with Omni-shield conversion
Reduced shield arc, reduced shield deployment speed, and control limitations - omni shield orientation, active-group weapon aiming point, and camera are all controlled by cursor position.