You'll need a mod from Nexus or similar site. Bug-fixes if considered a priority is all you'll see moving forward—no feature changes, removals, or additions.

Alexa, play "It Feels Like We Only Go Backwards" by Tame Impala.

Moving on isn't going backwards. It's moving onwards.

Holding onto what's past is living in the past.

CP'77 is finished. CP'77 is not moving forward or backward. It's now part of CP'77's past. Revisit it as much as you want, but it's time to let it go and look to Orion.

There's a mod to do this. However I have learned the new system and it makes sense. Craft/upgrade your mods and apply them to your standard weapons as you upgrade them (by finding/buying/crafting new ones). Note that weapons you buy or craft will usually have two empty mod slots...weapons you find will often have (often inappropriate) mods already attached.