Some off the top of my head:
Tex Yoda: 60% with trackpoint. Wired. Cherry MX.
Cherry G80-11900. Cherry MX Black. Wired. Technicaly not a TKL because it has all keys but the keypad is above the trackpad. A bit plasticky, loud and not so compact but it should be possible to acquire a used one with high-quality keycaps in German layout on German eBay for less than 20 € if you set up a subscription and get lucky.
The G80-11800 is an older version with trackball instead.
Combine with a Bluetooth mouse:
Varmilo VB87M is the only TKL wireless Bluetooth keyboard I know of, and AFAIK it has been available only in US-ANSI layout but I may be wrong.
Anne Pro is 60% wireless Bluetooth - should be available in ISO now or "soon" according to the manufacturer.
Search also for "lapboard" and "lapdog".
Other than that, wireless mechanical keyboards are unusual.