Be patient and, in the meantime, get the correct sight-screws.
Things have a way of showing up.
When gun shows become a reality again, keep your eyes open for one.
Watch ebay and gunbroker. The KragCollectors Association forum have a couple of parts vendors listed in 'classifieds'.
Look at messed-up 'sportered' Krags. A carbine sight could be hiding on an Old 'Deer Rifle'.