Will just cut slots and see how it goes,
When you have cut the slots,get some decent "thick" washers made 2/3mm thick,with a size hole ... diameter of the bolt retaining the strut.
Set the camber as you want it,tightened the bolts up and then tig/mig weld the washers to the strut .. only needs a couple of decent tacks.
I did this on a set of Valver struts for my Williams rally car ... lasted until I put some Williams Bilsteins on it ... sold off to a bloke who is still using them ... saves on camber bolts etc etc.
Any machine shop can make the washers for a few quid .... If you want I could get you some made .... just let me know.
Rod