So here’s a cautionary note. If you alter your Bosch mid drive and return to a Bosch dealer for service, the service interface will identify the modification and lock out the motor. Game over. Presumably this is also how it works with Bosch’s Flow app and updating your system. I haven’t run into this yet but we’ve been warned to watch for it.
If you modifications can be”removed” prior to interfacing with the service system you could be fine, but be warned, Bosch is pretty unforgiving about this stuff. If you don’t plan on getting factory updates, fine… go to town. However, if a Bosch powered bike comes into our show we often check for upgrades as a normal part of a service, so you’d want to ask your friendly tech to keep his phone away from your bike while he works on it. ( yes, we use our smartphones to check your drives while they are in the shop. We also adjust your SRAM and Shimano derailleurs with them on bikes with electronic shifting. My own Bosch powered lump even sends me a text when an update is available )
Kind of like buying a new luxury car and finding out a year later that there’s a subscription fee to cover certain options like your heated seats
Or air bags.