I think you should take a more scientific approach to work out an answer. Assuming that you want to work for a UK airline list them down on a bit of paper and note how many of them take on low houred pilots. Remembering that the likes of BMI are no more, Virgin only take on 3,000hr plus pilots, BA want integrated self sponsored cadets and CTC has most of the loco and charter market operators sewn up.
That pretty much leaves Ryanair, Flybe and the ad hoc carriers like Jet2 and the TP operators. All of these operators pay peanuts and of course you are assuming that through this process of self selection that you (a) jump through all of the recruitment hoops and are selected ahead of the other 1000 people that apply and (b) can afford a type rating and possible relocation expenses.
I would be surprised if you get much if any return on your investment.
Incidentally I left a profession later in life BUT was very lucky and landed a jet job straight off from flight school in a unionised airline. That pretty much determined my future career in the sense that I didn't have to worry about putting food on the table, I now have thousands of jet hours from a reputable highly regarded airline. It also meant I didn't have to "build" hours and jump from pillar to post trying to get into a career airline whilst wasting years that I didn't have.
Unfortunately with the world on its knees for the foreseeable future I cannot see any return to the boom years when airlines were literally willing to give people a chance. Its now all about p2f, type ratings, MPL and cadetships for the lucky few. You might well get a gig at a very small operator but you will spend years trying to get into a decent carrier and I can't see any payback for your monies. Of course all bets are off if you have industry contacts but the reality is they are few and far between and most airlines are being dominated by HR departments that are trying to weed out the nepotism that once existed.