I would be surprised if air taxi operators lose any pilots to airlines after 1000 hours. Extensive experience in single pilot operations is not considered with any huge interest by airlines these days. The attention now is on CRM. Many airlines base their recruitment heavily on this quality. The work required to retrain a pilot, who has hauled an aircraft around airways as single crew, from a one man band to a multi-crew environment is extensive when compared to a recent graduate.
That said, and returning to the issue, the personality of the corparate pilot is quite different from that of the airline pilot and I suppose a company may seek an exemption if the right type of pilot pitches up. But don't bank on it; there will always be surplus pilots out there, now and in the future. 700 hours is what you need, I'm afraid.
Try posting on the 'Biz Jets and GA' Forum - I'll be interested to read what comes up.
Good Luck!