Sorry for the delay guys - but here is the info I've managed to work out so far
Killing Blade ROM information pulled from MAME:
Tiles - U14 Prog board
Sprite Colour Data - U9, U10, U11, U12, U2 Char board
Sprite Mask/Colour Index - U13, U14, U15 Char board
Samples - U1 Char board
Ketsui:
Tiles - U19 Prog board
Sprite Colour Data - U7, U8 Char board
Sprite Mask/Colour Index - U1 Char board
Samples - U17 Char board
So with this information we know that on the Killing Blade cart
Ketsui U19 Prog board -> Killing Blade U14 Prog board
Ketsui U7, U8 Char board -> Killing Blade U9, U11 Char board (Skipping U10 to put the second ROM in the correct position in the memory region map with the larger sized ROMs)
Ketsui U1 Char board -> Killing Blade U13 Char board
Ketsui U17 Char board -> Killing Blade U1 Char board
The biggest problem I see is that Killing Blade seems to use Colour Data ROMs of half the size to Killing Blade. KoV2 uses ROMs the same size, which is I guess why it's more commonly used for the conversion.
I'm hoping by putting the new ROM in the correct position for the memory map that this will still work (in much the same way many conversions work on CPS2)
The bad news is that Oriental Legend Super uses the same ROM board as Knights of Valour 2 (according to MAME) and the smaller ROM type, but is not listed as a potential conversion candidate.
Interesting that Killing Blade is actually listed in MAME as a conversion candidate for Ketsui as well, however the example given in MAME is for DoDonPachi 2 Bee Storm
The worse news is, apart from being able to replace the ROMs themselves, I have no idea how to modify the PAL - which I definitely know I'm going to have to do since I'm going from 8 ROMs for sprites down to 3 - and unless someone actually has a Killing Blade converted to Ketsui or Espgaluda I have no idea where to even start.
Work in progress