If you're in the "China Clay" world and not too invested it's much easier and cheaper to use Royal Card Room as the big denoms and demote some smaller denoms to 39mm Majestic.
I'm not sure what the big denom is in your game but if Royal Card Room $1ks are of interest I'm selling some
here. You can also see how I jazzed up the big denoms there with a custom color matched inlay replacement.
Alternatively find or make Royal Card Room plaques for your big denoms and in doing so keep using what you have as is. I don't see Royal on Apache website but I guess they existed??
https://www.pokerchipforum.com/threads/20-apache-royal-card-room-plaques.130272/
BR Pro Plaques or oversized chips or most plaques you can find made or made to order or will still be cheaper than 48mm Paulson chips.
--Diz