Using the language server from v11.1 in v11.2 works fine. It may require a bit of work. But if you have a VM or an old unused laptop - install v11.1 and copy the "c:\Program Files (x86)\Embarcadero\Studio\22.0\bin\DelphiLSP.exe" to the 11.2 installation.
Help insight wont work, but everything else does. It may take a while for Embarcadero to fix the LSP issue, so it really is worth the trouble...