Disk brakes are the best way to go...You do not necessarily need to change the front fork though...What i did on my build was use the usual caliper adapter which has a fork that resides in the spindle at the drop down...if your able to find the right size Aviation use, "Adel" clamp that fits around your front fork and locktite the nut and bolt hold down for it, it will not budge and be quite sturdy, i have hundreds of miles on the set up now as proof of the pudding...I also do not use the stock spoke wheels but use mag wheels as they are already set up to directly attach disk rotors without use of flimsy adapters...DAMIENDisc brakes are best but you will probably need a new front fork and new front wheel, but decent "V" (rim) brakes really are good enough.
Follow the links and instructions starting from a post I had made below sometime back, (Dec. 6th 2021), in how to do the changeover I did and most of the things you will need to do this...Enjoy...DAMIENDAMIEN1307 I want to copy what you did with the brakes. Can you provide more specific information on caliber brand, model you used, adapters you used. Front and Back please.
Like you said "the usual caliber adapter" but I am unsure what that is. I can see the disc in back is much larger than disc in front.. did that require special modifications ?