This seems like the most trivial way to solve this problem?
Have we reached out to the maintainers of the issues templates and asked them what they think about updating the templates themselves for mobile friendliness?
With template styles being rolled out, the proposed designs would be very easy to implement using the existing tools editors already have.
A crude example here: https://en.wikipedia.org/wiki/User:Jdlrobson/Page_issues?useskin=vector Shows how uncollapse behaviour might work.
cc User:TheDJ (not sure if you are following this conversation)