Belt disc crankshaft: impact screwdriver or counter holder

Moin people, I have to solve the pulley on the crankshaft with my Corsa, because of control chain changes and ZKD. Because this is very tightened (220 Nm) I think about whether I should get a hit screw. Einhell battery system I already have, unfortunately the Einhell impact screw does not work at all, even with wheel nuts fails. A good counter holder however also costs about 40 Euro. But a good impact screwdriver with battery set and charger 300 Euro upwards… Hm…ei However, I don’t really need the impact wrench, I have all-weather tyres and change of wheels is rather rare with me. Does the belt disc with counter holder (I already have a long ratchet key) go down ? Should I use a 2nd man ?What do I have to bear in mind then, I don’t want to ruin the screw. I actually have good nuts – a BGS tool case with which I was always satisfied so far.https://www.ebay.de/itm/325684498724?… extra high-quality (and like expensive nut) then I buy this. Recommend me a good counter holder! Thank you for your tips already in advance!