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You might find 2mm ones off the shelf more easily than 2.5mm? These people will make you whatever thickness you want for not a huge amount of money. https://www.ultraturn.com/ of course so can a hundred other companies closer to you or indeed anyone with a lathe but finding one who will do little jobs like this for a reasonable amount can be tricky.
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There are both 2mm and .5 mm spacers here. Could combine to make your 2.5
Slight hijack: Same question except 130mm wheels to 135mm rear. Is there a recommended spacer to buy or do I just crank the QR tight?
Ideally, I would use a sleeve that extends the hub axle, but I can't find a 2.5mm for both sides - only 5mm for driveside.