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What can I do to remedy ISA cash/shares transfer latency?
One possibility you may consider is to keep all of your funds in the stocks and shares ISA while investing that proportion you wish to keep in cash into a tradeable "Money Market" ETF. A Money Market ETF will give you rates comparable to interest rates on cash and at the same time it will give you "instant access" subject to normal 3 day settlement of equities.   This is not exactly a perfect solution.  Most Money Market ETFs will pay monthly dividends, so depending on your timing, you may have to give up some interest.  In the worst case, if you were to sell the day before going ex-dividend, then you would be giving up a months interest.  In the best case,  if you were to sell on the day of going ex-dividend, you would be giving up no interest.