@fyrfli with a collaborative spreadsheet, you are "programming" in the most accessible way currently possible. why abandon it over #Google or some missing last-mile scripting customization?
I say #Ethercalc is a good replacement, there are many free services providing it. It doesn't have encryption, but maybe you could self-host it or look for a service that lets you use it only via VPN. or #Cryptpad services, which are encrypted - paying cryptpad.fr for hosting your data would fund them too.