Different people have different reactions. Some ppl might not even get calluses after intense playing.
But if you have calluses and want to keep it at its current state, you should try to avoid using softening soaps when washing your hands. It's quite hard to find a non-softening one on the counter these days, so just try not to wash your hands unnecessarily.
My double bass teacher (who has been teaching for 50 years by the way so he must be right) said you could use alcohol or any drying organic solvent (make sure it's safe to the body first!) to prevent your calluses from cracking due to cold weather or because the calssuses are breaking away from your skin.
To start getting calluses, just play a lot and HARD! But if you don't have the luxury of doing that, you can try keeping your fingers dry. I worked in a petrolchemical plant before and we produced tonnes of acetone and this thing dries like a towel on ecstasy. It's not safe to inhale it in large amount as it would cause throat irritation or in the worst scenario, bronchitis. But a dab on the tip of the fingers would be just fine.
I have very mild calluses on my plucking fingers (i use middle and index alternating and rake sometimes) barely visible but can definitely feel it if you compare it against my unsed ring and pinky fingers of the plucking hand.
I have a big callus on my fretting index finger but it's due to the double bass frets and mild calluses on the rest of my fretting hand.
In my opinion, calluses are more important for the fretting fingers because it gives the tip of my fingers a good and firm grip on the spot directly behind the fretbars (for bass guitar). This in turn gives the bass a really clear, mature and warm sounding tone. I believe in correcting the techniques to get a good sound and not getting devices and gadjets to supress/correct one's sound.
I use a light- er touch on my plucking hand most of the time. To cut through the mix if you're recording, just increase the volume. Or you can just tell the guitarist/s to reduce his damn freaking cone creasing ear-deafening volume which by the way applies to most guitairsts these days

I practise digging hard into the strings too just in case it might be needed in some part of the songs.
Hope that helps.
Andre