Likely someone has already done this, but just in case....
I found many function names in the IPL string table after decrypting it, and perhaps some of them could be of use to figure out missing NID names (if this has not already been done with these strings coming from the IPL) .
Here are the strings:
boot.c:
sceKernelBootLoadFile
flash.c:
sceBootLfatfsMount
sceBootLfatOpen
sceBootLfatClose
FlashInitialize
lfatfs.c:
sceLfatfsEntry
EraseAndFreeBlock
SegmentCreateLpt
CreateLPTable
LFlashBlockBufferWritePage
FlushWriteCache
AllocFreeBlock
FreeFreeBlock
LFlashSync
ReadPhysicalBlock
ErasePhysicalBlock
WritePhysicalBlock
IsBadBlock
DoMarkAsBadBlock
SegmentAddFreeBlock
WritePhysicalPageExtraOnly
PbnToSegment
UpdatingPhysicalBlock
EraseAndFreBlock
SegmentGetLPEntry
SegmentLbnConfirm
LFlashUmount
LFlashFormatBase
DetectChipMakersBBM
SegmentSetLPEntry
SegmentGetFreeBlock
ReadPhysicalPageDataAndExtra
ReadLogicalPage
LpnToPbn
ReadPhysicalPageExtraOnly
LogicalAddressConfirm
LFlashMount
BootSequence
SegmentInit
WriteLogicalPage
WriteLogicalPageWithCache
ReadPhysicalBlock
CheckElfSection
sceKernelCheckExecFile
sceKernelApplyElfRelSection
sceKernelLoadExecutableObject
SceLoadElfBlock
SceLoadelfOverlap
sceKernelAllocPartitionMemory
bloc.c:
_AllocPartitionMemory
sceKernelResizeMemoryBlock
sceKernelQueryMemoryBlockInfo
_allocSysMemory
SceSysMemMemoryBlock
MemoryBlockServiceInit
sceKernelQueryMemoryPartitionInfo
sceKernelAllocPartitionMemoryForUser
BlockForUser
_FreePartitionMemory
sceKernelQueryBlockSize
_freeSysMemory
partition.c:
SceSysmemMemoryPartition
PartitionServiceInit
sceKernelCreateMemoryPartition
PartitionInit
_CreateMemoryPartition
_DeleteMmoryPartition
sceKernelDeleteMemoryPartition
sceKernelFillBlock64
sceKernelMemset32
CopyBlock_Forward
CopyBlock_Backward
sysmem.c:
sceKernelSysMemInit
SysMemReInit
SysMemPostInit
OtherKernelPartition
sceKernelSysMemMemSize
sceKernelSysMemMaxFreeMemSize
sceKernelSysMemTotalFreeMemSize
sceKernelCreateHeap
SceSysmemHeap
heap.c:
HeapInit
_AllocHeapMemory
_CreateHeap
_FreeHeapMemory
_DeleteHeap
protection.c:
PartitionProtectInit
sceKernelSetDdrMemoryProtection
memtest.c:
sceKernelSysMemCheckCtlBlk
sceSysEventForKernel
sceSuspendForKernel
sceSuspendForUse