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Anything involving water is going to do weird things to the existing paper. You might not want to hear this but I'd strip it all back, smooth it out with easifill or whatever, then mist coat and repaper. Yes it's a faff and yes it would take me months to get around to it all, but anything else is likely to look a mess.
For the avoidance of any doubt this wall has been this way for >6yrs and was previously covered with tiles until today.
The options are
A. tile over as before
B. Lining paper over the existing plaster to meet the other lining paper above.
C. Some sort of hybrid plastering blended into the lining paper above.