Worth also bearing in mind that "500 hours on type" isn't in itself a solution. Airlines will look at how, where and with whom those hours were completed. Some of the presentations wouldn't be touched with a very long pole!
Somebody who is career progressing from a recognised, quality company, is regarded as a very different commodity than somebody who has payed to put themselves in their own version of being that commodity.
For airlines who may well themselves be TRTO's, they are not the least bit interested in buying in problems when they simply don't need to.
I understand why people are attracted by this "grey market" of SSTR's, but tread very carefully because it is not always viewed as an attractive proposition by the type of companies that you might hope it is.