That term Rinji Seishiki (Special Contingency 臨時正式 ) from Nick Komiya who was neither a collector than an military expert, read that word in only one document and you all jump in that boat and call this nonsense name which doesn't refer to a sword type.
Call it what ever but Rinji Seishiki is total worse. It sounds like an obsession
You could search the whole wide net about this 臨時正式 and you will find nothing.
"Sweetheart? Yes, darling. Have you seen my "Special Contingency" sword? Yes, it's in the umbrella stand. Could you tell me, why do all the other officers have Type98 and you have a makeshift sword?
Oh, darling, I'm just a sucker."
Btw. The first "makeshift" special contingency rinji seishiki swords with high quality gendai-to blades came out 1942. And why the IJA produce low quality showa-to blades from medium range smiths equipped with your so called "high quality " Type98 mounts?
They put scrappy showa-to blades into a bling bling koshirae and expensive tamahagene forged gendai blades in a special contingency koshirae for what? Blaming their officers?
Is that really that what you belive?
The type 3 has iron fittings. The type 98 is equipped with brass fittings. Did you think the ancient samurai walk into a war with brass fittings?