Not clear if you read my post trying to help you appreciate (if not understand) that it's not simple.
According to the product page
@DCLane shared the rims have a braking surface (for rim brakes) and the internal rim width is 15mm, so max 32mm tyres (like the OP's current ones - see image). And double butted spokes (28 or 32) with brass nipples (tick).
Ref the 1.8mm spacer, it'd be worth taking the current cassette off and checking what spacer is there: if two: happy days. Otherwise LBS, I suggest or:
Spa Cycles
But the hubs:
"The Road2 range of hubs are the perfect balance of strength, weight and performance for road riding. Designed with durability in mind, the
oversize axle and large PCD flanges give better spoke angles [assume 135mm OLD] than lesser hubsets for stiffer and stronger wheel builds.
Screw on endcaps and oversize 15mm thru axles for rigidity and superior performance for front hubs. Oversize SKF custom bearings and
17mm axle gives epic durability to the rear hub . . . "