If you have an iPad, you could use a couple of setups:
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I have an iPad Pro so I use a Type C hub (the edge clip on style) that let’s me connect a Roland UM-One USB to DIN MIDI adapter. This same hub has a mini jack on it that I use a mini TRS to 1/4" TS splitter for audio out.
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A camera connection kit to use the same Roland UM-One MIDI adapter and the native headphone out jack.
I’m sure there are a lot of solutions for playing back long samples on the iPad but the one I never thought of and that my friend uses on a super old iPad is Traktor Pro DJ. I’m not sure about the MIDI support for it though. I imagine it has some MIDI implementation as I believe it does work with controllers. It would host a ton of long samples for you and it supports queue points so you can setup long files with start points.
As for reliability? I’ve not had a ton of issues sending MIDI into the iPad. My biggest concern is the reliability of the attached hub. The Type C port doesn’t seem to seat all connectors firmly and it can, in some circumstances, lose its connection. An overcomeable problem but one to be mindful of.