Each cryptocurrency unit represents a very different amount
of energy used to mine it, but currently they are traded as if
they are equal, in most cases... This creates socio-economic
crypto-inequality. Wallets trick people by not showing
invested energy (kWh), but could easily be modified to
do so.

Idea: universal wallet that works for all coins based on
electricity energy invested as universal inter-currency
exchange rate...

Personally I'm still confused about where the original / core
(or base) value comes from for most crypto currencies.. but
then I'm still more comfortable with gold sovereigns than this
newfangled paper stuff :)

Similar to H.G.Wells's concept of the "Air Dollar" in The Shape Of
Things To Come, where currency was "backed " by the average
unit cost of international air freight.

What percentage, of the kWh stated, is to calculate the difficulty of the bit transaction's actual mining cost? Maybe some shopping round needs to be done.

There is a small amount of energy, called the Von
Neumann-Landauer Limit, or Landauer Limit, which
sets the theoretical minimum amount of energy
required to flip a bit in an ideal, theoretical
computer system - "No irreversible computing device
can use less energy than this, even in principle".

This limit can be used to show the average
amount of energy that would be required for a brute
force attack - "...in order to simply flip through
the possible values for a 128-bit symmetric key
(ignoring doing the actual computing to check it)
would theoretically require 2^128 − 1 bit flips on
a conventional processor. If it is assumed that the
calculation occurs near room temperature (~300 K)
the Von Neumann-Landauer Limit can be applied to
estimate the energy required as ~10^18 joules,
which is equivalent to consuming 30 gigawatts of
power for one year" (see link).

This
approach could be used to calculate the 'cost' of a
cryptocurrency unit - i.e. it would be the bit
length of the numbers used in the 'coin',
multiplied by the minimum energy for flipping a bit
implied by the Landauer Limit.

[Skewed], me too. And that's why this idea, it's
basically, to beat the unreasonable prices.

Just because some crackpot wrote that 1kWh buys 1
BTC today, and it will exponentially less, as the system
is adopted by more people, because they will compete
for same interval of time, is a Ponzi scheme element.

//Von Neumann-Landauer Limit// But that only applies to irreversible computation. If you're prepared to let your computer sort of slosh backwards and forwards through a calculation, until it happens to go all the way through and produce an answer, the Limit no longer applies.

I know this to be the case because, when required to produce a complex Excel spreadsheet, I have found it's much less effort to just fudge the answer, then go back again and correct it if anyone complains.