Just hire and bill it on the job.
Keep your ££££ís in the bank.
Yup, this works well if you use different equipment for each job, or just don't take many pictures for yourself. Using the same equipment you'd use for *paid* work is kinda the "de-rigueur" for most I'd imagine...
I know of many a photographer who rent themselves their own gear, and bill it separately on the invoice. Both editorial and commercial shooters.
One of them mentioned to me that if he DIDN'T rent to himself, and simply "hired" the equipment, he'd have been out over 150K last year in RENTAL FEES(to himself, money back in HIS pocket, equipment paying for itself). Of course he doesn't own the generator trailer necessary to run all his stuff on-location, but that's another matter entirely.
Yes, most photographers simply cannot afford to plop down £/$100k on a full-blown Broncolor/Profoto,etc... lighting kit w/ all the trimmings. So we hire as needed, outside of what we CAN afford to own without living on pork-n-beans everyday