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Finally, does anyone have any good ideas to minimise dust entry to the machine other than putting the machine inside a cabinet.

Dust covers which are sold or shred a vacuum cleaner bag as

a DIY project.

I tried this, but airflow is very impacted. It's better to have naturally low airflow (low fan speed) than to put a barrier on the path (air will pass elsewhere, and will accumulate dust where you don't expect it : in the DVD-tray opening, near the connector palates, etc.)

Probably this is the case, but I meant if you have fan sucking air in, then put such cover beneath finger protector or between two finger protectors. But I was just a suggesting, probably someone have ruled it out, because fan might heat more by trying to suck a vacuum. Or vacuum cleaners have ~1kW motors because of reason.

I second you if you have just fans pushing air out. System will suck air from 'easiers' point available.

But dust is the most common material in universe.. :) You cannot get rid of it easily.