This isn't realistic at all. Assuming actuaries know Python like they know Excel, the only other added cost is someone technical to slap together a working environment, which isn't particularly hard when compared to the state of what Excel offers in a collaborative environment.

You just don't jump from "humans in Excel" to "CI/CD perfected pipeline" overnight, nor do you need it.

Excel shops still have costly expenses rewriting entire workflows/re-doing Excel files constantly as people come and go, it's not like there isn't already maintenance cost with the current method.