Hmm, this argument seems somewhat unconvincing, because on my last bike I used Deore cassettes and chains, and my chains lasted about 2,000 km, and after three chains I also changed the cassette. And it was a regular 12-speed Shimano system.)) Of course, there are no mountains in my area, but I only...
@Chah, fair point on the durability argument. If you were getting 2,000km per chain and three chains per cassette out of Deore 12-speed on flat Estonian terrain, you were already doing well. The Linkglide durability gains are most dramatic for riders grinding up steep, muddy climbs all day. On flatter ground with decent chain maintenance, the gap narrows considerably. I won't oversell it.
The cost-per-replacement argument still holds though. A Linkglide chain and cassette set is significantly cheaper than 12-speed XT consumables, so even at similar lifespans you're spending less each time. But if you're happy with how long things last, it becomes more of a "nice to have" than a "must do."
Now, the good news on your hub situation. Your DEFT 8.0 800 runs SUNringlé Düroc SD37 Expert wheels with SRX hubs.
The SRX hub has a swappable freehub body, which is exactly what you need. Hayes sells replacement freehub bodies for SRC and SRX hubs in Shimano HG (both alloy and steel), Microspline, and SRAM XD variants.
Since your bike came with 12-speed XT on Microspline, you'd just need to buy the Shimano HG freehub body for the SRX hub (part number 281-31520-K001 for steel or 281-31520-K002 for alloy). I'd recommend the steel version for Linkglide as the steel cogs are harder on alloy splines.
That's the cheap driver swap I was hoping for. You pull the old Microspline freehub body off, slide the HG one on, fit your Linkglide cassette, and you're done. The rest of the drivetrain swap (derailleur, shifter, chain) is straightforward bolt-on stuff. And you keep the Microspline freehub body in a drawer in case you ever want to go back.
So the total shopping list: SRX HG freehub body (steel), CS-LG700-11 cassette, RD-M8130 derailleur, SL-M8130 shifter, and CN-LG500 chain. Not a bad rainy afternoon project.