Would SLX cranks with a Hope 34T chainring fir together?

And, do I need any other fitings?

Yep and yep (short chainbolts, possibly chain device)

should fit fine (assuming they are both 4 arm and the BCD is the same)

if you’re not using a bash ring, you’ll need shorter chainring bolts.

Dave

How can i find out if the BCD is the same?

And do i need a bashring?

No, you don’t need a bash.
I have a hope ring on a XT chainset so a SLX should be fine. Just get a 4 bolt ring.
How are you going to stop the chain bouncing off the ring?

The chain does not always bounce of the ring. I used to ride 1 x9 on a hardtail many years ago before it was fashionable and I never dropped a chain riding around Thetford Forest. However Thetford is tame compared to some places so it depends on where you ride, how you ride and if you are riding a full susser.

Eventually my cassette and chain wore out I replaced it with a single sproket.