Post It is very basic. It's designed to post articles. If the property doesn't need anything move, then it might work. Just make sure you set the expectations right, post it can have modifiers like sides, sauces, etc. There's also no splitting and no pre-check.
As far as billing, you can do room charges or pay in the spot (no need to transfer to a PM). We have some express-type customers utilizing this. As long as the F&B operation is simple and fits the customer's expectations, it can work.
Now, if they finally want to go this way you might want to consider using a Thermal Printer if that is legally allowed in the country that is going to use it.
It makes the printing experience much faster same as we normally do in every POS installation.
Since POST IT has its on PRINT TASK in V5 you can do it without affecting the rest of FOLIOS.
Considering how easy is to setup Post It you should consider a demonstration for the customer so they can see for themselves and be part of the decision it will either choose Post It or ask you for a POS quote but they will appreciate that you fully took it to the end.