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I do rev match my downshifts but never double clutch, that's what synchros are for.
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Synchros aren't there so you don't have to double clutch, they're there when you can't double clutch (racing). I've got 2 manuals (@92K & 121K) with all their synchros in tact. It's because I double clutch on every single downshift. If I need the synchros for occasional rapid upshifting, they're there, however they'll wear with constant abuse.
The 4000-2500 shift isn't as bad as you think because the synchros have the natural clutch spindown to work in their favor. When you downshift without double clutching, your synchros have to accelerate the clutch which is a lot more work.
What I'd do if my 1st and 2nd gears were that far apart is:
1. Not wind out 1st gear to 4K rpm if I could help it. A gear that short is probably designed for high torque climbing, towing or just barely getting the vehicle in motion after a stop. If you shifted at 2500, you'd have only a 1000 rpm drop to deal with.
2. Slip out of 1st without clutch, then clutch into 2nd halfway there.
Double clutch now on downshifts, or double clutch later, every shift.
