The Lothar Walther Barrel Blank current Price is on their web site but I believe that is about right.
The firing Pin Might be large enough so it could be offset Drilled for a .078" Diameter Dowel Pin to use as a replacement tip positioned to fire a CF Primer.
That would save A lot of Machine time.
Of course the Hole for the New tip would need To be drilled into the Breech Block at the Correct angle to match The original pin bore axis.
I have discovered that Standard SAAMI ".25ACP" chamber reamers are made with a TAPER to the Chamber body for ease of function in a Semi-Auto Pistol. This Allows the Fired Case to "Bulge" if the Chamber is more to the 'Large End' of the SAAMI Tolerances.
Not Good For Reloading Life of the case.
I have Ordered a Custom, Straight Cylindrical Body Chamber reamer at .2795" Body diameter for .25ACP from JGS Precision Machine of Coos Bay, OR; to see if that will correct this problem. you might give Grant Gulseth at JGS a Call (541-267-4331) a call to see if he could make a similar Reamer for you at the same time. The JGS Drawing is "job_407237-25_ACP_WS.pdf".
Best Regards,
Chev. William