Any point in upgrading stock cables for a LPS?

Yes, definitely.

My best cables are for Dac, streamer (linear power supply) and amp, in that order.

Then good cables for DDC, network switch (lps), router + 2nd network switch (dual lps), and power conditioner.

Okay cables for Uptone USB Regen, and modem (lps).

Absolutely, yes.

On my 5v LHY LPS for my Node 2. The sound signature of various brands of cords is discernable. I can easily hear the difference between two cords that are the same cord (the no longer available Cable Pro Vitality) but, each of the two has different ends (Iego Gold vs. Oyaide 004). The cord with the 004 ends is clearly better in this case.

Once you adopt the idea that everything matters in your audio system, from the wall receptacle all the way to your speaker footers, then the idea that power cords can be and often are very component and even system dependent needs to be embraced.

A shielded power cable of sufficient gauge for the amperage involved should be suitable. But, if you have extra "audiophile approved" cables laying around then, why not?  Better yet, if you have both then try each and listen for differences.  Once you have it nailed, have a friend or spouse switch them without your knowledge and let us know what you hear.

I say no based on experience with the Sonore OpticalRendu and the 'audiophile' power supply and audiophile cable they sell for a lot more money (not power cord) I compared this audiophile variant vs 2 other standard OpticalRendu's. I was not able to do a perfect A+B comparison since I did not have 2 identical DACs.

After this experience I am not spending extra on these type of power supply cables.

Yes.