I ran into this problem with a codec chip. We had to run the output at 48 khz, and the input and output clock had to be the same. Well we didn't have enough CPU to process the input at 48 khz, we only cared about 8 khz bandwidth for human speech. Boxcar averaging then decimating produced way too much aliasing, so much that the ML classifiers wouldn't work. The solution was putting a honking large FIR anti aliasing filter on the codec, like 100 taps, because -that- chip had oodles of CPU to spare as it turned out.

Why FIR? It had a super sharp cutoff and of course linear phase. If I'd known about Bessel filters at the time I'd have tried those out. Live and learn and ship it.