> hardware support, like 600Mhz clock, CAN, FPU, RTC, other hardware peripherals which the RP2350 lacks

FWIW, those are all NXP-provided features on the chip, not something Sparkfun has any particular connection with. There are other iMX devices on the market, just not in this form factor. And there are other vendors with SoCs offering similar performance.

Really one of the biggest problems in this market is that everyone is putting the abstractions in the wrong place. We've all collectively decided that this stuff is scary and we need comforting IDEs and hardware uniformity to deal with it.

But... portable software and frameworks are hardly new ideas. Come over to Zephyr and see all the stuff you can run on boards from basically everyone, including NXP.

There's a lot more great hardware for your project than just Teensy, so stop locking yourself in.