More than 3 named drivers?

hello. I understand you’re allowed two named drivers as part of your motability lease, and one extra for a fee. I was wondering, would I be able to pay for a 4th and a 5th named driver? I do not have one individual carer but my mum & step dad, my boyfriend and my dad  all help me. I would be a named driver but ideally, it would make my life a lot less stressful if all 4 of them could be named on my car. I have good specific reasons for each person and circumstance. However, I will just say that the car would live and remain in my possession, so nobody would use it or be able to use it to benefit themselves and not me. I won’t be able to drive all the time and I rely on all of them individually and for different reasons. I am going to call RSA motability tomorrow and ask but I was curious to see if anybody else has already done so. For clarification, I do not yet have a motability lease. I went looking at cars today with my dad, and we have found a suitable one. I just have to decide which 3 people should be named and who should be left off. I understand that temporary drivers are allowed but I see all these people regularly, and they’ll all be helping me use my car for my own personal needs. Therefore temporary drivers insurance would not be suitable for us. Thank you for ready this much gobbledygook. I hope this makes sense, I am very tired. Goodnight!