To upgrade the RPi in the zBitx will 'require' repackaging the radio, as the RPi it ships with, an RPi Zero 2 W is about half to one-third the volume of an RPi 4 or 5.
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The RPi Zero 2 W has the same processor as an RPi 3B+, and half the ram (512M). To upgrade it would require an RPi 4 or 5.
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The size issue isn't a concern with the sBitx, as the RPi 4 and 5 are physically the same size.
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The question to be answered is if the sBitx or the zBitx needs more RAM, more CPU, or both to run the apps you're mentioning along with other radio duties.
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I'm looking forward to hearing about your experiments,
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Ken, N2VIP
