disk brake options (factory) 73 Scamp

Hello. I'm new to the forum but not to cars...... lol. old guy here. I sure this has been answered in some of the threads on here, but I haven't actually found the answer that I seek. So, I'm gonna kick the proverbial "dead horse" again. Have a 73 Scamp that I just purchased. From the Build sheet it is a 73 built in Dec of 72, therefor it has the 4" bolt pattern on 10 front drum brakes. Have searched a lot of the threads on here about aftermarket kits, bolt this, bolt that. All valid and good answers, however, I need to know if I can bolt on factory disk brake rotors, caliper brackets and calipers to my drum brake spindles. According to my research, the wheel bearings (inner and outer) are the same size between the disk rotor and the drum mount. If this is the case then would the rotors not bolt to my spindles and work for a daily driver? I know hoses will have to be changed and caliper brackets sourced, but the other parts can be purchased at local parts store. Please help me understand if I am correct or not.. Thank you all for your posts. I learn something every time I read them.