It would probably work, plastisol goes over just about everything.
Press your inkjet transfer normally, then place your plastisol transfer, and cover the entire design with a protective cover (teflon sheet, etc.) to protect any exposed areas of your inkjet print from your upper platen.
Press your inkjet transfer normally, then place your plastisol transfer, and cover the entire design with a protective cover (teflon sheet, etc.) to protect any exposed areas of your inkjet print from your upper platen.