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a Zike 666 case which will ensure at least “3800MB/s” transfers as fast or faster than with the internal HD of my macM1max under SEQUOIA and also faster than the USB3 HD provided by BIAB.
Nope.

Your max data speed is limited to 2800. The theoretical maximum is 3200MB/s + 800MB/s for video from a single NVMe blade over a 4-Lane USB 4 cable but that has never been achieved in a test laboratory. Your M1 Max internal SSD has approx 4600MB/s if using one NAND and 7600MB/s if using a pair configured RAID 0 (users have no ability to configure internal storage on a Mac). Apple doesn't tell us if their AS Macs are using one or two but the largest NAND they use is 4TB — I know that my 8TB M2 Ultra is using a pair.

Although this is faster than the 500MB/s theoretical max for any USB 3.0 external, it makes practically no difference. Sound is actually quite slow in the real world. Many of us have tested the differences in response. Although my Drums and Real Tracks live on an 8TB NVMe 3 x4 blade over USB 4, it's because I hate the sound of HHDs, not because it's faster—because it ain't.

BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5