What would need to be done to extend the floatation inserter generation to include the long-handed bulk/fast/burner inserters from the aforementioned mod?

That mod appears to do that generation in the data-final-fixes stage; I'll try messing around with resequencing inserter flotation and adding an optional dependency on that mod and see if it meshes appropriately, but it could be a bit until I get around to it.

More Long Inserters author here: I believe this compatibility may actually be fixed.

I haven't tested extensively, but I somewhat recently moved all the inserter generation from data-final-fixes into data-updates (I found a better way to ensure all the relevant fields like rotation speed are re-copied over, in case they were modified after the initial copy)

Maybe it depends on load order, but in my current playthrough, I have access to floating variants of all the new inserters

I'll push an update sometime soon to add an optional dependency for guaranteed load order.

I'm not sure what's going on, but I have an existing save with this mod, Dredgeworks: Frozen Reaches, More Long Inserters, and Heat Inserters, and now I get an error about circular dependencies when loading:

Failed to load mods: Circular dependencies detected

Mods to be disabled:
• dredgeworks (0.8.12)
• dw-frozen-reaches (0.3.6)
• heat-inserter (1.2.4)
• kry-inserters (5.1.11)

I think it's related to the changes that were made in this issue. Let me know if I should start a separate discussion.

In the meantime I've downgraded this mod and More Long Inserters, and the save loads normally.

Found the issue, contacting associated mod author.

Fix is underway, it'll happen over on the Frozen Reaches/Heat Inserter end.

Awesome, thanks!

Should be fixed up now, as of Frozen Reaches 0.3.7 and the Heat Inserter version it depends on. If it's not, let me know here or on the Frozen Reaches page (depending on what element is breaking).

Indeed seems to be fixed now, thanks again!