So you have a pair of skis and alpine boot that you are happy with, and consider changing just the binding to an AT-binding?
You say "1-2 days tours". Overnight stay? Lots of vertical? Typically more than 4000 feet a day? Are the approaches long in your area? Weight can be very important for your comfort while touring, especially if you are going people that are in better shape than yourself and/or on ligthweigth gear. If you are in better shape than your touring comrades then weight might not be important at all.
Some years ago I changed from frame binding (fritschi) and burly boots (scarpa tornado) to dynafit bindings and a dedicated AT-boot used on the same ski. Saved 1500 g pr pairs and with no loss at all in skiing performance of boots and bindings. Try saving 1500 g on skis without loosing performance. Walking comfort on boots with better walk mode and bindings with pivot point further back was also a big change. Wondered why I didn't do that before . Many people will say go tech right now, cause thats what you will end up with anyway.
I sometimes ski the dynafit setups at resorts if that is what I have at hand when traveling, but always miss my alpine boots when doing so. The dynafit bindings however, do their work just fine, even at the resort. Dynafit will work for sidecountry for most people.
Seven years after my first AT setup I now have maaany pair of skis (6) and including two sets of dynafit bindings. My deep powder skis are still shared between AT use with dynafit and alpine with alpine bindings and alpine boots.
Swapping is a bit of work and it depends on a lot of things if you will be happy with that solution. If your AT/resort split is shared between going on trips to "backcountry destinations" and "resort destinations" then swapping is easy and will work very well. On the other hand if you tend to go one day touring and next day resort and your crew will not decide before looking out the window in the morning, then it depends on your tolerance for gear fiddling in the morning...
So in simple words my advice is: If you are happy with your current alpine boots, go dedicated AT-boot and dynafit binding. Skis with inserts for both alpine and dynafit if appropriate. Then expand you ski selection towards your needs, buy used if money is limited.. Don't plan on binding swapping in the parking lot with changing conditions, too much work.