How can I tap continuous threads through opposing tubing ...

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I have a hollow inox tube 40mmx20mm with 2mm thick walls that I would like to drill through-holes into and then tap them M5 suitable for M5 inox bolts. This tube will be used on a piece of furniture as a type of pivot arm etc...

So, I have been looking at the available M5 manual tap tools on the market and they all seem to have a maximum thread length of only 16mm. This means that once I finish tapping the first top hole, the thread won't be enough to continue tapping the second hall, since the gap inside the tube amounts to 16mm (20mm - 2x2mm).

I would like to have a continuous tapped thread in these through-holes to be able to screw M5 bolts and them cut them off flush at the end, then polish the surface of the tube etc. for a clean finish.

I am not sure how I can do this if most of the taps have the 16mm thread limit. Is there a way to overcome this, say by inserting an M5 nut underneath the first hole (maybe with superglue), which acts as the "extra" material for the tap to be able to continue tapping the second hole with continuity to the first tapped thread ? I thought about stacking up a few M5 nuts inside the hollow part of the tube (4 x 4mmM5 nuts), but not sure if this would work.

Any thoughts or suggestions would be appreciated.

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