Many common (and inexpensive) parts from Aliexpress are suitable for the Fishertechnik constructor with a little finishing - in the most literal sense. Finishing can be done in a variety of ways, (to save space) I decided to stick with the Dremel Lite 7760 with complete abrasive attachments plus a # 561 universal bit for milling and drilling.
Optionally, a jaw chuck for a drill, M2.5 and M3 taps with a handle and a mini-pipe cutter (children can use it themselves) or a Dremel disc for cutting metal (a table and a vice are very desirable for cutting, otherwise make a smooth cross cut extremely hard, I didn't succeed, but with a vice on the table - it's easy).
Servo drives SG90, SG92R, MG90S
These servos can be easily modified to fit into a standard Fischertechnik servo holder for steering systems . Note that the holder has built-in limiters for the rotation range of the "hand" on the servo shaft, if they are not needed, they can be easily cut down.
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And I will also add that the original hoses can be easily replaced with similar ones, with an inner diameter of 2-3 mm (original 1.8 mm, but 3 mm hoses are useful for connecting a third-party compressor and other parts with a large diameter of pipes) and an outer diameter of 4 mm (so that they can be easily inserted into Fischertechnik cubes). The silicone hose is good for pneumatic devices, while the rigid hose is useful for decorating toy cars and more.