For example if my overall budget is $40k a year and $6k of it are these accrual type expenses what do I physically do with the $6k a year, if anything? Let's say I do nothing and it builds up to $60k and then have some major repairs and car or health costs and use it all, would I just pull out the normal $40k and the $60k on top of it and would that hurt my retirement success chances?
If you're using a 4% withdrawal rate (or lower) with 100% stocks, failures come from sequence of return risk where the market crashes early in your retirement and you spend down too much of your principle to recover even when when it starts growing again.
If you last enough years, the compounding of growth of your 100% stocks protfolio gets far enough up, even with taking out 4% each year that even bigger crashes aren't going to derail your retirement.
So anything that pushes part of your budgeted annual spending out of the early years after you retire and further into the future is going to increase your success rate, not decrease it.
Also remember that withdrawal rates are usually adjusted with inflation, so taking out $60,000 after ten years is actually less spending in inflation adjusted terms than $6,000 a year for ten years, so the first would represent a smaller hit to your portfolio than the second.