Just a small status update. A few days of other activities like a hard rock concert and a visit to some old dear frinds delayed any printer activities for two days.
Tried to use the instruction linked to above. Went from bad to worse unfortunately

now the printer does not even react on connect command.
I must have set something wrong somewhere even though I ticked off the instruction step by step. I kind of get lost in those endlessrows of attributes without line breaks for each value. I may well have changed a value for another attribute because of that.
Ah well, will have another go at it this evening.
==== And the evening came ...
Got a very useful tip from my son, the computer wiz, that the things that sometimes makes files hard to read in Windows is due to lack of line breaks. There are two kinds of line breaks, the carriage Return (CR) and the Line Feed (LF), Windows only likes one of them and discards the other, so the .h-files obviously use the other

There is though an OpenSource program - of course - called
notepad++ that seems to be able to recognize both.
Downloaded the program and tested with one of the example files in Marlin and it becomes a whole different thing to edit files when they are readable!

With a normal Windows Notepad it looks like this:

... and using
notepad++ it looks like this

This makes ever so much easier to edit the files correctly. Must check the all the files as well. Thought it might be a useful tip.
BR
/Peter
/Peter