| A 34" scale will do it, and string count won't matter that much. Oddly enough a 4 might be better as you will have one less string pulling on the neck. I'd suggest .145 .110 .090 .075 as a place to start, and you ought to be able to get these gauges as single strings online or at any decent music store.
The biggest issue you will have is that once strings get to about .135 to .140 they don't behave like bass strings very well. They start to lose upper harmonics because strings of that gauge don't vibrate as freely.
There are two types of strings that will help maintain the upper harmonics better - taper core, and bare core strings. This provides a smaller gauge across the bridge saddle and lets the string vibrate a bit more freely.
You can do this with strings alone but a longer scale would serve you better - I'd suggest a 36" scale instrument.
I know what it is to want this A - it is the reason I built my basses in the first place.
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