That's the general way highliners do it.
Two independent systems. One is the slackline and the other is the safety line. The safety line is dynamic rope and taped to the bottom of the slackline. Safety line is has slack so that the angle it makes is less severe reducing the load it receives if it's needed. It's important that when you fall you don't hit the deck so take into account the line height, slack in the safety system, stretch of dynamic rope and length of rope between your harness and he safety line.
I've never done this but have read plenty so don't take my word for it. DO some research and if your not sure, don't risk it!
Don't use a locking biner for attaching the lanyard. Most people use either steel rings or figs of eight
There's a ton load of us in the North West that regularly highline in Liverpool or we travel to the slate quarries when we fancy.
Alternatively, if you're down south there's a load of trickliners that also dabble in highlining.
Best thing to do is to ask around in the UK Slackline Association on Facebook.
We recently did a quick little video for Sony if you're interested. Come join us.
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