Good option IF power is available and would be my first choice. OP didn't say there was power (I was assuming there wasn't). And a lay flat discharge hose would work with it too.
Only downside is that particular pump has a float switch to stop it when the water level falls, so won't pump pond out below that level. Unless someone is standing holding the float up or some sort of stick and string arrangement made up for it to hold where it won't shut off as water level falls.
Syphon hose blocking shouldn't really be a problem if a big enough diameter is used. A garden pond seller (oddly enough) should have something suitable and probably better priced than my earlier links.
50mm should do it, don't think it'll be particularly quick even then.
OP says water is available, so to get syphon going. Lay out hose, seal lower end (hand over the end), fill hose with water, put top end into pond, remove hand from lower end. No (ugh) hose sucking required.