Though the cost of a sand blast gun is within the warden budget, I submit this for HIVE input.
Sand blast guns have two main types. 1) sand hopper on the gun (rejected) 2) sand is siphon fed.
The prime wear points are nozzell and trigger.
A safe Amazon choice at $15 Sand Blaster with 10 Foot Hose, Sand Blast Gun, and Wrench - Siphon Feed (Campbell Hausfeld AT122601AV)
It appears the CH nozzells are unique to CH
A number of manufacturers have copied each other and have interchangeable ceramic nozzells
Or save a buck and go eBay
$16 on eBay 8in1 Sandblaster Gun Air Siphon Sand Blasting Gun + Iron / Ceramic Nozzles Kit
One of these plus some heavy long sleeve gloves sets us up to try sand blast in the current cabinet.