DM,
After just spending 3 days on the line with a new 73 FO, no you dont get any pay until you pass your sim check with Virgin, the pay check we call it. Been like that for the last 6 odd years where guys/gals have had to pay for their own endorsement.
Yes it is a very big ask. Been there done that. Had to do exactly as you described with a mortgage and two kids, wife no worky....................
Certainly not the best way to enter a domestic airline, didnt like it but did it. Hopefully one day we can change these requirements such as paying for endorsements etc. I wouldnt hold your breath though.
What ever you decide, with who ever you decide, I hope it goes well.
Regards,
Servo