Supporting distinct skilled team members

Situation - 

Team members consisting of Data scientists , Front end developers & Dev Ops. Take it as a group of I shaped people in a scrum team. Of course T shaped team members would have been ideal. But with this team its difficult as the skills are little more diverse at least with a presence of data scientists. Moreover its not easy for other members to learn it (in order to support) plus personal motivation in learning new distinct skill is another point here. During refinements team forecasts the work / size the PBIs & usually sizing is done by the members who can accomplish the work (eg: FD unable to estimate or size for DS & vice versa). But at the end there is a product goal and all these skills are needed to create the integrated increment. Each sprint team works to create increments in line with product goal. These increments can be integrated or can be non integrated ones depending upon the Goal. 

Now problem with this cross functional team is that they are not able to converge until the work needs integration. Therefore, the work is executed in parallel by particular skilled members (silos). Dependency is high in this case and with no influence or support within members generally there are spillovers. We are thinking on the lines of early integration of work or introducing CI/CD. But are we looking at the one side of the coin only ? Is there something else we can also try ?

If you been in similar situation , what you & your team did ? Any success/failure stories or insights , suggestions are welcome. :-)