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Which strategy? If you mean the first one, i.e.
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This will not work, and is likely to break your save, causing it to crash or hang when loading it like you described.
I was referring to the second one (quoted from CaptainArchmage), but...
But it's possible Dame de la Licorne tried the two in same save instead of separate saves.
I did do this. I'll try again with a new back-up save, using just CaptainArchmage's strategy, now that I'm back at my DF computer.
- Dame de la Licorne
Edit: OK, I think I've managed to get it to work. At least, the save has loaded with no error messages or crashing once unpaused, and display cases show up in the carpenter's list of options. Since I have a modded game, this is what I did:
1) Made the backup.
2) Copied [TOOL:ITEM_TOOL_PEDESTAL] and [TOOL:ITEM_TOOL_DISPLAY_CASE] and [PERMITTED_REACTION:MAKE WOODEN DISPLAY CASE] (from the newest entity_default.txt file) into the save's entity_default.txt file, under [MOUNTAIN].
3) Copied the entries [ITEM_TOOL:ITEM_TOOL_DISPLAY_CASE] and [ITEM_TOOL:ITEM_TOOL_PEDESTAL] from the newest release's item_tool.txt file into the save's item_tool.txt file.
4) Copied the reaction [REACTION:MAKE WOODEN DISPLAY CASE] from the newest release's reaction_other.txt file into the save's reaction_other.txt file.
5) Applied the following from CaptainArchmage's strategy:
3) Load save, use devel/inject-raws tool ITEM_TOOL_PEDESTAL tool ITEM_TOOL_DISPLAY_CASE
4) Immediately save without unpausing.
5) Reload game, enter code devel/inject-raws reaction "MAKE WOODEN DISPLAY CASE"
6) Immediately save again without unpausing.
7) Load game. If it loads without problems, you should be ready to go.
I'll report back once I've successfully made and built a pedestal, but there is hope.