What everyday ingredient will emulsify rapeseed oil?
I think you will have much better luck if you just wait to get an appropriate almond extract. Aside from the difficulty of mixing an oil based flavoring, you'll run into texture issues if you do get it mixed. Generally an emulsion will be thicker than the component liquids. Further, the flavor probably won't be what you want. If you're creating a water or alcohol based solution, an alcohol based extract will flavor it better. Oil based extracts are generally better for things with a higher fat content for the flavor to disperse into, ie: even if you get the oil emulsified, you won't have an almond flavored liquid, you'll basically have almond flavored droplets suspended in another liquid.

If you really want to go ahead, I'd recommend lecithin and/or a hydrocolloid like guar gum. Both will result in the end product being more viscous though.