find a gun with 26" barrels and sell the 30" gun to someone who needs/wants the longer barrel.
or buy a 26" set and have them fitted, won't be as cost effective
you'd lose a lot of value on cut barrels - and 26" guns are not currently in favor so you may get a deal
finding a set of tubes someone else already cut may save some money -
watch ebay
https://www.ebay.com/itm/Parker-SXS-...sAAOSwunNeEUCj
just make sure you get the same frame size