On Beatles pinball machine there is an extra target that does not exist on Seawich.
When you drop these 3 targets on Beatles, there is another target sitting behind those 3 targets. This mod could be done on Seawitch mechanically. If the code writers could code and additional switch and some bonus points, it might add a little more to do on Seawitch.
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If a 4-place drop target could be coded, the 4th target could be a saucer switch sitting behind the 3 drops. And then the saucer would kick out the ball which would feed into the left inlane. Since the saucer would be the 4th target, hitting it would raise the other three targets and force an inlane drain. Instead of a saucer switch, a standup target or single drop target could also be used.
On this PAPA video you can see Bowen shoot the ball in behind the lowered drops and see it exit to the inlane. You can see it at about 11:48.
This will give you an idea.
Mechanically, it would work. Could it be coded?