Flavours don't generally keep pre-fermentation, but as almond contains almost no sugar (2g/oz) they won't ferment very much. you'd be better finding a way to add them in post fermentation imo, ie this;
just an idea...don't see it as cheating, you'd need to work hard on the recipe for the beer you're making - i'd probably suggest caramel and biscuit specialty malts, maybe a little wort caramelizing :) mmm. you'll want it more sweet than dry too.
ps - let me know how you get on. i'm tempted to make an amaretto clone "fermented beverage" at some point, so this might be useful!
That looks perfect. I'll get some and do a quantity test in a few pints. I slipped some amaretto into a pint of stout tonight. Was lovely and potent! But a bit too sweet. This should be perfect.