I don't think you'll get a timely or meaningful response asking through Leica UK. Always best to ask Wetzlar in my experience. That said, I'd be interested to hear their response to the question as I'd consider having the swap if it is remotely reasonable in cost.
Leica said that the cost of changing the viewfinder on the O Series Type One from wire frame to Galilean, would exceed the cost of the whole camera. Not sure about that myself as it looks to me as if all that would be needed would be to remove the wire finder and top plate, then drill and tap four new holes for the Galilean. However as the Galilean finder was only ever issued on a limited edition, Leica would not even be prepared to consider doing it. Slightly surprised at this somewhat negative response. I would have thought it was something that Leica's à la carte division could do with about 2 to 3 hours work. However it forced me to get a SBOOI viewer, which is actually far better to use than the reverse Galilean on my I[C] Standard. I also have got a FISON hood, with tatty chrome on the front section, which I picked up for next to nothing. I will cut it back to bare brass then paint it satin black with my air brush. I may decide to paint the SBOOI black at the same time, then pick out the engraving in white with a fine point paint stick but it doesn't actually look that offensive in chrome. The SBOOI was a bit loose in the shoe, which I cured by sticking a transparent self adhesive 3M Bumpon cylindrical sticker onto the bottom of the viewer, in between the two arms of the shoe fitting and then trimming it down with a scalpel until the viewer was a firm but not stiff fit in the shoe.
Edited by wlaidlaw, 24 February 2017 - 15:04.