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@Rik_Van_Looy
If you're comitted to making this work and are happy to wield a hammer and chisel in a creative fashion there is an alternative to suicide fixed
A cheap pressed steel sprocket (3/32"), can be locked onto the hub thread with a bottom bracket lockring - hopefully there'll be enough turns on the thread to fit both and it will be happily locked in place - works especially well on a steel hub thread where there's no chance of thread stripping.
Also if you get stuck removing the existing block, spin off the recessed front plate (turn CCW with a hammer & centre punch (or big nail)) when it comes off, remove the sprocket block, discard the bearings, pawls and sprockets and try gripping the body with a mole grip. If that fails, spin it off with a hammer and cold chisel....