In past this problem was solved in PC world by using hardware overlay (VGA feature connector), later it was shifted to hardware-software overlay, currently some hardware (like flicker fixer) solutions can be used but AFAIK no one offer such solution on market (PC market then even less likely on "Amiga").
So for hardware Amiga clones i can imagine module that take RGB data from Amiga chipset (sprites, dynamic changes of color registers, pixel data) and with block transfer use, send those data to the any 3D card as a RGB plane (texture?) - then with use modern hardware full (at least for not tricky video timing) compatibility can be achieved.
i know that You expect a bit different answer but... IMO chip (FPGA) that take digital data from Amiga video output and convert this to PCI/AGP/PCIex block transfer together with some code on 3D card should be doable.
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