Unlicensed staff here insert foley's so it's not a stretch for them to reinsert a dislodged g-tube. However, that isn't something I would choose to delegate, I would do it myself and have on several occasions. It's not one of those tasks on the techs check off lists.
We have a radiology test, "g-tube insertion" or something like that, that we can order after we reinsert a tube. They inject gastrograffin or something like that to check for patency and leakage, afterwhich we can restart the tube feeding. An MD need not be involved, except to give the order to re-insert and for the xray.
I only pre-sume this is o.k. with the nurse practice act. Silly me.