A pinblock serves one purpose, to hold the pins against the tension of the strings while allowing them to be tuned properly. If you are experienced with Delignit, it should be fine. If you are not, you should not be trying it out on a good piano. Are you aware that you need to build up the pinblock?

Bluethner hammers :

I consider that the hammers sold by the factory are necessary if one want to keep the original tone.
They are all bored 90° on the shank, but sliced with an angle.

The only hammers that can be gang filed all along

I have compared Bluethner mounted with standard hammers, and with the good ones : the tone is really different.

(also they have a very good felt and pressing, voicing is very quickly done, a pleasure to work with (but provide them strings height and flange center height so you receive the good hammers for your instrument)

PS Pinblock is a part of the sound body on first grade grands (due to transmission of vibrations within the case and keybed, the differnce when delignit is used is obvious)

Then, Delignit is a good material also, for instance on a piano where the case is supposed to be inert and the iron plate is more active to colour the tone, the pinblock can be heavy and non resonant, but maple traditional blocks are always better (for pin tightness also I prefer them)

RK4211, I am very interested in old Bluthners, and I would be very grateful if you could post a picture or two of your piano. Particularly of the strings and plate.

I want to scan in the frame and invert the image. I will then use the inverted image and use a 3D milling machine to cut the new pin block. This will avoid having to build up the pin block and the milling machine will mill away the troughs.
This should make the fit more accurate and the work required will be less. The result should also be excellent as scanning and milling are to the micron in required.

What is the oldest Delignit block you are aware of?

I will take some photos tonight and try and post tomorrow.