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NDS fail.
Looks like Ultegra so you'll have to ditch the rear mech and get ANY matching rear shifter and derailleur combo.
SRAM is cheap as chips and yeah Shimano compatible if your chain and cassette are not worn.
Either keep the front derailleur as a chain keeper or get some narrow-wide chainring and single ring chainring bolts to make the swap.
Honestly can't see why 1× unless you're going on trails/Enduro etc to prevent the chain from dropping on the chainring.
Chain and cassette wears much quicker, noisy drivetrain and yeah you'll replace chain and cassette much more often.
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7800 chainset with 44t race face narrow wide, scrap 11 speed XT mech, SLX 10 speed shifter, deore 10 speed 11-46 cassette
Shimano fibbed when they said 10 & 11 speed MTB wasn’t compatible.
Cheapest option is deore 10 speed you can do 11-42 or 11-46, 11 speed deore you can do 11-51.
Saeco CAAD would make a great FBRB.
Le Pub Bike out for its first visit this year