1x Conversion FC-T8000

That crank is essentially just a 104/64 triple with a fancy big ring. You need any 104 BCD narrow-wide chainring of the size you want and that can also clear the frame (you'll be putting it in the middle position where your 36t is now, so you'll need to eyeball what kind of clearance you're working with now to determine what will fit). 104 is the most common NW ring size so you have plenty of options. You need a set of singlespeed chainring bolts and you should also get a new chain.

From there you don't necessarily need a new RD and cassette if you're saying the entire reason you're doing this is that the gear range you have without ever shifting in front is adequate for you. If that's the case then all you're really getting out of the deal is the benefit of a clutch if your existing RD doesn't have one, but I think it's probably an RD-M786, which does. If not, it is true that clutch RDs plus NW rings are the combination that make 1x work reliably without additional chain retention devices, so it's not a bad idea. If you did want a wider range your existing 10-speed shifter is compatible with any of the 10-speed Shimano 1x RDs i.e. RD-M6000-GS plus any 10s 11-42 cassette. There's also similar Microshift RDs and cassettes. There's also the various hacky extra-wide-range 10-speed cassette setups like the Wolf Tooth Goatlink plus a Sunrace 11-46, but those are even less likely to be worth messing with for you if you're happy with your current rear gearing without shifting.

Doing this to a perfectly functional drivetrain is really unlikely to increase your overall enjoyment or usability of the bike given the money and hassle. About the only time I see it really making sense would be when you've worn out the stock drivetrain and want to change things up a little for the next go-around when you're going to be spending a bit on it anyway.