Good idea to open a BYOS thread.
I did a lot of modifications on my Speedys I hold. Many years ago I had a couple of original vintage Speedys but sold them over the years - before they start to become that expensive which they are today. With a modified Speedmaster you did nothing else than Omega does today with all the vintage re- editions. But the prices are much more cheaper than Omega want to have for there " re- editions".
I am happy to hold really a lot of spare parts, dials, set of hands, cases, case backs, crystals, movement parts etc. I collected these items for many years. Spare part policy of Omega changed over the years. Happily I have contact to an AD for Omega watches with level 3. And the watchmaker is a wonderful man who supports me in what ever I need. And he is very skilled which watchmaking. See my statement about the hesalite crystal changing of a FOIS.
I think, the parts you mentioned will never ever be available in the near future. I think, if they will be available, than you have to send the part on an exchange part back. But I feel very happy with your statement that building our own Speedy seems not to be a sacrilege. As far you tell everybody what you did.
Please find attached some pictures of my BYOS
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