Hi,
Can a SVL and DAD links work for a high availability connection between two switches at a distance of 200m?
Sure. For SVL, if you are using a 10Gig or 40Gig, you just need Multimode fiber transceivers. For DAD, you can simply use 1Gig transceivers.
10Gig SFP-10G-SR
1Gig GLC-SX-MMD
Multimode transceivers can reach up to around 500 meters.
See link for more info:
https://tmgmatrix.cisco.com/?si=9600
HTH