Hi Jan,
my shakiy QL is not suitable for repeated internal ROM changes. It's needed for QL60 development and I don't want to fully ruin it.
Maybe someone else is willing to test? Some people on the forum probably have equipment like external ROM adaptors or ROM switchers.
If nothing else helps, how about a QIMSI version that comes with the ROM emulation from SD card covering 0...$BFFF, but no SD driver ROM? That might still fit the small FPGA. To overcome the power-on race condition, one could do a manual reset, as long as it is only needed for testing. Note that I'd need to develop the FPGA first and probably won't be able to do that in the coming days.
Peter