Hi Kev, actually I'm not sure that people who've walked the Sanabres would know, as we didn't go that way! We bypassed Lalin on the way (typically) to the albergue at A Laxe.
I suggest you open up
Mapy.cz, navigate to the Lalin area and make sure you have selected 'Outdoor' map. Then you'll be able to see exactly how the camino route passes to the West of Lalin town (and also see that the Invierno goes right through it). And you'll be able to see a number of small roads that branch off at different places up and back towards Lalin. Looks like you've got plenty of options to choose from.
PS if you are concerned about getting lost when you go off-piste, you can download the
mapy.cz app along with the relevant map (free) your phone and then if you have GPS you can track where you are in relation to the camino and Lalin without using contract data. Worked faultlessly for me on a recent camino.
Cheers, tom