So the provincial government is the president of your HOA
Weed and Feed is a great broadcast agent that you may be able to get away with...very little weed killer in it but noisy neighbors would probably notice.
Another option is to get a hose end sprayer for your garden hose to apply liquid fertilizers.
I use liquid fertilizers applied from a tow behind tank sprayer and the results are great. The link below details many reasons why liquid application of fertilizer is best.
Then, go get some Weed-Be-Gone liquid herbicide...it comes in small bottles that you could then pore into your
fertilizer hose end sprayer out of the view of prying eyes and then spray. Better yet, pore the Weed-be-Gone in an empty liquid fertilizer bottle in your garage and then pore into hose end sprayer in front of the neighbors
I use WBG and it is great. No muss, no fuss.
http://www.outsidepride.com/catalog/Liquid-Lawn-Fertilizer-p-17898.html