I've always found codeine and booze to be a very sickly mix: opiates and alcohol just don't combine that well, in my experience, and a recreational dose of codeine on booze is guaranteed to make me vomit. I'm also pretty sure you can't get the full benefits of most opiates with alcohol in your system - apparently, in the old Far Eastern opium dens, it was considered a waste to smoke after drinking. Throwing up from a mix of booze and opis is NOT like an easy throw-up from opis alone, which can almost be pleasant: it's a gut-wrenching, full-body-sickness feeling that lasts until I sleep it off.
The only opiods I've found that go well with a drink have been American synthetics - hydrocodone (vicodin), and, to a lesser extent, Oxycodone. Problem is that vicodin's a mix of hydro and paracetamol, so drinking on it's bad for the liver: and, of course, we can't get vics here anyway. I never had a chance to CWE them, because my ex-gf, who had a 'script, didn't approve of such 'drug geekery', and because the hydro's so low dose (these were 5mgs hydro/500 paracetamol), in the pills, I thought it would be all-too-easy to lose most of the goods while filtering. I've never had more than 30mgs at a time (roughly equals 180mgs of codeine), but found that dose far more euphoric than say 300mgs of codeine - I'd love to have enough Vics to CWE them and try a high dose, say around 100mgs.
Now my tolerance is too high to bother CWE'ing what we can get over the counter in Blighty - it takes two 32-pill packs of extracted paramol for a decent buzz, and even then, I need to potentiate, front and back, with diphenhydramine and promethazine to get anything approaching a nod, making it ridiculously expensive, and not remotely worth the risk of liver damage - some APAP always gets through, and the more pills you extract, the greater the danger. I wish I had a source of DF118s, but morphine's much easier to get hold of.
Back on-topic, has anyone tried CWE'ing Solpadeine migraine? They're not cheap, but they seem to filter very well, producing an almost completely clear solution, and contain something like 12.5mgs of codeine a tablet.
I'm dreaming of an English version of 'Sizzurp' - find some old-fashioned codeine linctus, throw in some oramorph to add strength, and maybe add a couple of sweets and some sprite for flavour. Chase with promethazine and relax.
Sorry for the long post - I'm on MSTs and trams, and they make me sorta chatty. Especially when there's work to be avoided.