Bracelet for Omega Constellation 166.055

Hello,
This is my first post here and I hope it’s allowed.

I recently bought my first vintage Omega, a Constellation from the 1970s (166.055), and was very happy with it. Unfortunately, after an ultrasonic bath, the band fell apart. Today I received the sad news that this band can not be repaired. The watchmaker also told me that an alternative strap could not be found, as the watch has a special bridge. He also told me that I could order a new bracelet (1155/146) for 530€. The watch is very dear to me, but over 500 euros for a new bracelet hurts a bit. Unfortunately, I can't find a used bracelet with the reference. Do you have any advice on where I could find one, or would you advise me to order a new strap?

I would be grateful for any advice!

Thank you for the answer! Then I am really in a dilemma. On the one hand, the watch is of course useless without a strap, but on the other hand, I find it difficult to buy a strap that is about 60% of the purchase price of the entire watch.