You know what - the enuresis clinics can go and take a running jump!
I have lived this. Both as a child and as a mother. I've gone through most of the treatments, either myself, my siblings or my children.
Shall I tell you what works? Whatever is least stressful.
I remember how upsetting it was for me. I used to get up after my parents had gone back downstairs and disconect that bl@@dy alarm.
If a child is physically not ready to be dry, then no training, no restrictions, no rewards, no lifting, and no alarms are going to change that. All theses things are going to do is increase stress and upset everyone.
However, if they are begining to be physically ready to be dry, and lifting them keeps them dry, then go ahead. Because ditching the nappies and waking up in a dry bed will give them such a sense of maturity and self-respect. And will make life so much easier for you, too.
A child who has been dry, and starts wetting again, needs to be assessed for the cause. Starting school is a reasonable cause, as is the, birth of a younger sibling, a house move - any upset to the status quo, really. Overtiredness can also be a cause, as can threadworms, UTI, or other illness.
A child in this situation needs support, not training. Make sure any illness is treated, of course, or stresses addressed, but go ahead and lift them, keep them dry, keep their confidence up, and when they are ready/less tired/settled in the new school etc, they will take over keeping themselves dry again.
BTW, re waking them. I tried, but ds1 is such a deep sleeper it was impossible. Eventually I stopped trying, just got him to wee. Nonetheless, after about 12m he was taking himself off to the loo independently.