Steve,
dont be worrying, get a McMillan that is what you want spec wise and Staffordshire Synthetic Stocks to modify it to be a left hooker-simplest way to get round the time problem.
they will obviously charge for the pleasure but they are excellent at modifying stocks, they did a McMillan for me a couple of years back and it's stood the test and remains great, so a little cut and shuffle won't be too much for them
Give them a call to see if they can accommodate what you need
reecy