But you're suggesting any "typical" track fork.
For one, there's the factor of fork
length. According to Sheldon, forks with the same rake only mimic the same handling when length is not altered.
http://www.sheldonbrown.com/rinard/forklengths.htm
So no, not any "typical" track fork will create the same handling. Because the specs on the wide range of any available "typical" track fork can be different.
If you put a fork with different lengths, the frame's ht and st angle will change, therefore changing the handling.
Typical track forks will have about 30 mm of rake, very similar to all of the Rensho forks I have ever seen. Yes, some will have a few mm more or less, but if you think that matters you're deluding yourself. As for fork length, it will also vary a few mm, but not much more than that. Again, that has essentially no effect on handling, angles, or anything else.
And apparently you find nothing special about "bikes". "Bikes" are "bikes" to you, nothing special. Even if they're hand-made by a master framebuilder vs. one mass-produced in a factory. No difference. Same thing. Makes me wonder why demand for hand built frames are high. Or even question why bikes are priced so differently. Maybe you need to realize the differences.
If one bike is handmade by a master, and another is bult on an assembly line, but both use the same angles, lengths, and tubing, what is the difference? Appearance, and nothing else. The bike built by the "master" will generally look better -- although you should know that the finish work and filing of a San Rensho is generally regarded as fairly poor, by people who care about such things. Demand for fine handmade bikes is generally driven by folks who know and want top quality AND great appearance. Demand for NJS stuff is, frankly, driven by teenaged trend followers who generally don't even know what NJS is about. Before the fixie fad, NJS bikes and parts drew no particular premium -- especially considering that racers outside of the Japanese keirin circuit prefer the lighter and more aerodynamic bikes that are disallowed by the keirin association.
Supposedly "80s track bikes" are the same as NJS track bikes. I don't know the specifics, but you would think, that after 20+years of experiences, inspections, crashes, and new technology would not affect the standard of NJS certification. Really?
Really. NJS certification is not about making better bikes, or faster bikes, or bikes sprinkled by pixie dust for extra goodness. NJS certification is about ensuring that no keirin rider gains an advantage by using a better bike than his competitors. That's all.
Then again, bikes are only bikes right? Just pieces of tubes stuck together in a shape that will allow a person to pedal from point A to point B. No changes. No differences.
So just get a "typical" track fork.
While you're at it get a "typical" bike.
Identical things.
At least when we're talking keirin bikes and good quality 80's track bikes made in Europe or America, yes. The tubing and angles will be essentially -- if not perfectly -- identical. The mysteries of track bike design were settled decades ago, and until alernate materials came along, there was no real disagreement about how to make one.