Yet the WCML is pretty much fully clockface. So why do non-clockface paths work for Morecambe?
It's a 10 minute running time, so one unit should be able to manage half-hourly (just), particularly if you used a 2-car 195 so it could accelerate quickly on the WCML and run at 100mph on that stretch. You'd have to be willing to cancel a round trip to bring it back on time if it ended up late, though. Might even be worth timetabling in some such gaps at very quiet times of day, ideally consistently so you know that (for random example) xx00 from Lancaster and xx15 from Morecambe runs all day.
The problem is that for one unit to do a half-hourly service, you only have a 5 minute turn around at each end, and you can't have any pathing en-route.
Both of which are fine in principle - but the concept breaks down completely when you realise that there aren't gaps on the WCML that fit in with such a service.
You've particularly got to bear in mind that you have a conflict with north and southbound traffic, on arriving or departing Lancaster, and/or crossing Morecambe South Jn.
With a 4 minute headway, plus adjustment time to slow down or speed up at Morecambe South, you can see that it's an absolute nightmare to path.
Really what's needed is for the Morecambe branch to have its own bidirectional single line into Lancaster - it would then be completely independent of the WCML and neither would be constrained by the other. Unfortunately the River Lune rather puts paid to that idea!