A group wants to maximise the potential for surprise attacks using their stealthy members. They don't want their less stealthy members to blow a surprise attack.

A party of four; two stealthy, two not. The two stealthy members travel in to a room (~30 feet or so) and leave the two non-stealthy members behind the door/in the previous room (hidden).

The two stealthy members throw for surprise attack on some monsters in the room. After any surprise attack round, combat starts proper and the two non-stealthy adventurers enter the room and enter combat.

**Is this permissible under the rules? Would DMs allow this?**

This is related but disimilar from https://rpg.stackexchange.com/questions/46339/how-to-determine-surprise-when-only-part-of-a-side-is-stealthy. I am asking about the temporary splitting of a party to allow a stealth member only surprise attack followed by non-stealthy members entering room and entering combat.