A2 or not, Magnets don't degauss
that easily over time and certainly don't suffer to stay unused. Who told such fables to you?...
Also, the value of pots in original Tele Deluxe's is discussible. scroll down in this page to see what I mean:
https://www.fuzzfaced.net/telecaster-wirings.html
EVEN if we consider that original Tele Deluxe's had 250k pots, anyway, they were fitted with CuNiFe Wide Range's, having as I said
a higher Q factor. IOW: a pointier and narrower resonant peak. IOW: more high frequencies, more focused.
So, if one wants to compensate the lower Q factor (flatter resonant peak) of a Gibson style HB in order to make it closer to a "real" Wide Range, it seems logical to use higher resistance pots, whose action is precisely to narrow and elevate the resonant frequency.
Here is what pots resistance does to the resonance of any passive magnetic pickup:
http://www.jocidapark.com.au/circuits/GN2/pots1_zps8eb38254.gif
Now, here is the difference of resonances between MIM/Gibson style and CuNiFe Wide Range's:
See how changing the resistance of the pots would make pointier the black curves above, making them closer to the red curves of the CuNiFe?...
It's not even needed to change the pots for that. Opening an modifying each tone control to make it "no load" would take a few minutes then the guitar would behave as if it had 500k pots, with the possibility to come back to the initial 250k tone controls once their pots set @ 9/10 or below.
How to DIY a no load pot:
https://www.tdpri.com/threads/making-a-no-load-tone-pot.283492/
FWIW (= useful only if such explanations are took in account).