Sorry to hear about your van and the insurance issue.
As others have said this is a perfect opportunity for you to swap over to WFP. Are you frightened what your customers might think? I could almost guarantee WFP will do a better job than trying to do upstairs windows with a trad pole. Or are you more worried about the equipment and cost?
The most daunting part will be producing your water, do you have facilities to store an IBC tank? If not you could always get a van mount system.
If you don’t want to use hose reels and pumps there is a simple solution, get a tap fitted to your tank and fill a backpack or trolley using gravity, I have a 1 1/2” outlet, 1 1/2” tap and hose and it fills a backpack in under 10 seconds.
The biggest plus is you will have a lot more free time, you can’t put a price on that! Once you are up to speed you will be completing your work in a fraction of the time that it takes to do it traditional.
If budget is an issue due to time of year and your insurance troubles, get yourself a personal loan, pay it off over as short a term as possible and the interest will be minimal.
Remember there are a lot of members on here who will happily guide you along the way if you do decide to take the leap of faith.
Good luck with whatever you decide to do.