With 78s, the biggest factor is stylus size. You need a 2.5 or 3 mil stylus. There are a lot of options, but the easiest off-the-shelf solution these days is this:
https://www.audio-technica.com/en-us/at-vm95sp
Dual turntables are OK, but I wasn’t much of a fan when I had one. You’re better off with something direct drive like an Audio-Technica LP120 or the Technics 1200 mk 7. The best 78 tables made are the Technics SP-15s or SP-10 mk3 / SP-10R.
Phono stages built into turntables are absolute hot garbage. Don't use them.
EQ curves are another thing that most ’vinyl’ people don’t understand when it comes to 78s. Complicated to say the least, also somewhat difficult to ascertain for the older stuff. A lot of the ’book’ values are plain wrong and need to be carefully tuned by ear.
https://plugins.audacityteam.org/additional-resources/eq-curves/playback-equalization-for-78-rpm-shellacs-and-early-33-lps
The most accessible off-the-shelf solution is the Parks Puffin preamp. Almost every conventional suggestion I’ve seen over the years for 78 preamps tends to be nowhere near audiophile-quality due to a bunch of crap in the signal chain, cheap build. For true archival quality, you need both adjustible turnover and rolloff curves, not just a few cherry-picked approximate options. The best off-the-shelf EQ unit is the TImestep T-03EQ made by Dave Cawley in the UK (MSRP ~$3k).
If you’re running it through an RIAA preamp, you may need to reverse-engineer it on the back end to fit the correct EQ curve. The treble may or may not be underrecorded, and the bass may be too high. Depends on the record. Generally, too, some high-output 78 cartridges will not be a good match for higher-end preamps which are geared toward moving coil cartridges. You need to check the specs of everything to ensure you’re not clipping the living hell out of the preamp. You only make that mistake once.
If this is too overwhelming (this is just barely scratching the surface), consider hiring a professional to do it correctly.
https://www.arsc-audio.org/pdf/directory.pdf