I love 'Parashooters' Krag front-sight picture. It shows to perfection the detail of the original Springfield work!

'Milsurpshooter" - How long is your Krag's 'cut-down' barrel (measured with cleaning rod from muzzle to 'closed' bolt-face)?

If it were mine, I would make a simulation of a Board of Ordnance and Fortifications rifle (26 inch barrel) or a 'School Rifle' (22 inch barrel). Probably, a mock School Rifle/Philippine Constabulary rifle.

FWIW - I just have one 'knock-off' head-space gauge. A .073" - Field Gauge.  I feel comfort when a Krag's bolt does not close on it. It is also kinder to the Brass.

Check your Chamber very carefully to make sure someone didn't auger it out to take some kind of 'Blank'.

It is interesting that someone 'DEWAT'ed the bolt to make it non-firing???

Getting a good buy on a complete bolt on ebay is probably your best bet. Grandpa's Gun Parts, in the KCA 'Classifieds', has 'New-Old Stock'
model 1898 Bolts for $55, but, you would still have to come up with a Firing-Pin.

Have Fun you have a nice project there. It should make a good 'Shooter'.