The suggestions are good in a general way, however having looked at the HL Bonnie, which is a small electric high wing model, I suspect that the added weight of the flaps/spoilers and servo would increase the stall speed enough to negate any real improvement in landing. I suggest that small, fixed leading edge slats would add little weight and would reduce the stall speed significantly. The major drawback is that the approach would be much more nose high than without the slats and would take some getting use to.

Although it’s an ARF and little can be done about airframe weight, Using smaller servos and batteries could shave several ounces of weight and reduce the stall speed. A lighter wing loading will do wonders in reducing approach speed.