Independent time signatures, joining barlines problem

I want to preserve the original notation of extra barlines in this bar:

This is just quickly done with the line tool (has to be fine tuned later), but is there a way of doing this with independent time signatures? I guess that would be neater. I have been trying, but no matter what I do, the barlines won’t join the three staves in the whole flow; as soon as I insert an independent 3/8 in one of the lower staves, the joining barlines in the 6/8 before and after get separated.

Check Engraving Options > Barlines > Barline Joins There is a setting for polymetric.

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Perfect, thank you!