Well it hasn't ended yet, badly or otherwise. Your concerns are valid, and I certainly would not have built it this way for a customer, and I probably should not have encouraged the OP.
Now that the parts shortages have corrected somewhat, the plan is to cut the steer tube and insert a quill adapter. My preference would have been to go threadless from the start, but those parts were simply not available from my sources.

This is not a motorcycle forum, it does not use motorcycle standards and comparison is broadly irrelevant and confusing. For 140 years pedal cycles and motorcycles have evolved along divergent paths, the terms and technology are different. There are motorcyclists here, but they use pedal cycle terms and discuss pedal cycle technology because that's the forum's purpose. If you want a "bicycles for motorcycle mechanics" forum I suggest you start one on Facebook. OTOH if you want to discuss bicycles please use the appropriate terminology and try to keep the discussion on-topic.

I was going to comment further but I'm suspect that I'm still on the brink of banishment so I'll refrain.

Y'all have a nice day
Charlie

A threaded steerer tube sticking up 2" above the neck tube is inherently subject to get damage even if a quill style stem is inserted and "reinforced". So The right steerer tube (its original) or threadless it is.

Yeah I get that now. But you were using incorrect and totally confusing words in this bicycle forum. And you took very long to clarify it.

Are you going to do what was suggested by BICYCLE (not motorcycle) experts in the very early part of this thread and repeated - using an inexpensive and readily available threaded to threadless converter? Actually designed for the purpose? A very simple, safe and foolproof conversion? I haven't seen acknowledgement of that yet and you've wasted far more time in your confusing diversions than a conversion would have taken.

Then I see this:
Fercrissakes man. Just do it right! Easier, safer, foolproof (now I'm seeing the value of that word)

Cutting the threaded STEER TUBE so it isn't too long for the frame's HEAD TUBE isn't a bad idea as long as there's still enough threads to get the top bearings adjusted properly. And, although 2" is a lot, they make, and many bicycles use, spacers for that purpose.





Here's one of a million sources; Rene Herse Threaded Headset Spacers (1 inch) – Rene Herse Cycles


This link might help you to undersand the difference between a bicycle steering/bearing system and what you're used to on a motorcycle.
Threaded Headset Basics - Velo Orange

Not looking to buy more parts. Let me see what will fit/work.

Buying parts from a reputable dealer of bicycle parts (like your local shop or an online bike shop not random third party sites) is a lot cheaper than hospital bills.