Costs now, or down the line? Wheelsets tend to last longer due to the rotor being sacrificial rather than the rim, and will be future proofed better as discs are a more contemporary system. Lots of cheap hardware out there, but it would require disc specific wheel.
You can either use an adapter like the above, or get a frame builder to braze on tabs. Not always recommended but it looks like a strong frame in good condition.
Disc specific wheel is something I can't afford right now, but possibly sometime in the future it may be something to look at. Cheers for suggesting, it wouldn't have even crossed my mind. I'll see how much I use this first before I plan any more major upgrades.
Costs now, or down the line? Wheelsets tend to last longer due to the rotor being sacrificial rather than the rim, and will be future proofed better as discs are a more contemporary system. Lots of cheap hardware out there, but it would require disc specific wheel.
You can either use an adapter like the above, or get a frame builder to braze on tabs. Not always recommended but it looks like a strong frame in good condition.