I know nothing about the Alspa line beyond that it's the same hardware as the GE Series 90. Did someone tell that this is possible or are you just hoping it is because of the hardware?
Proficy has tools to let you import project folders originally created with Logicmaster or VersaPro. If the file structure of the Alspa project looks like either of those, then perhaps it can be done. Try starting a new project with Proficy, then right click on the PLC target, select "Import", then either Logicmaster VersaPro or Cimplicity Control folder and browse to the folder that includes your Alspa project to see if Proficy recognizes anything.