To conclude this post, I would also like to share my decision.
TR's support team was also unable to answer my question as to whether the $READ is still tradable after the change of stock exchange and referred to L & S as the stock exchange operator. One of the prerequisites for the shares to be tradable via TR is that the shares can be traded on several German stock exchanges and that they are liquid.
I am afraid that after the switch to over-the-counter trading in Sweden, trading will $READ will no longer be tradable on many German stock exchanges, possibly only in direct trading. The trading volume in Sweden is already $READ more than thin.
Conclusion: I sold today $READ sold today as the trading situation is too confusing for me. A re-entry and a further gamble on a squeeze-out may be played if trading is secured after all.
The sale will be posted if available.
VG your GordonGekko😜