Low tuned multiscale bridge placement question

[Rexel Matador]

I'm building a multiscale 4 string bass to be tuned to drop B flat (Bb, F, Bb, Eb) with a scale length of 900-850mm (approximately 33.5"-33.5")

Usually, using such low tunings on a 34" bass, I find that the saddle for the lowest string has to go way back to intonate properly.

The single string bridges I'll be using only have about 10mm of movement, so naturally I'm keen to get them in the right place. And I'd rather avoid having to plug and redrill the bridge screw holes if at all possible.

What effect will the longer scale have? Will the saddle need to be even further back, or will it mitigate the need for such an extreme adjustment to achieve correct intonation?

Are there any tips or tricks for determining bridge placement?

Thanks in advance for any advice you might be able to provide!