Does your IT policy allow using work laptops for personal use?
Yes, absolutely, with the usual caveats of not doing anything that might bring the company into disrepute.
I agreed with @EarringsandLipstick to be upfront with your potential employer and ask for their help. No decent employer will 'look down upon' someone who doesn't happen to have a laptop available.
They will however be even if only subconsciously looking to see how you problem solve. I would much rather you were straight with me that you don't have something necessary to do the interview, especially something which it would be so easy for me to provide by bringing you in to any office for the interview.
Organisations that expect you to provide all the equipment are, I would say, more likely to be at the dodgy end of the employment market.
Asking for their help will give you a lot of insight into how they organisation supports its employees.
I'll keep a look out in my local FaceBook group for any similar requests. I'm sure I've seen something similar recently. Especially since the pandemic our village volunteer group has been able to help people in all sorts of new ways.
I get that it is difficult to ask for help. There is lots here if you do reach out. Some of the most involved volunteers first got involved by asking for help then went on to develop the help that can be offered to others
Hope you find what you need. Good Luck