[RPG] Using the Grappler feat, can you grapple and pin (restrain) in the same action

Reading the rules in a strictly literal sense, I don't think it actually counts anything as a true grapple.

1. Make a ranged attack against a foe that has something you can pin (clothes, armour, bags) and something to pin it to (nearby perpendicular surface).
2. If you hit, you roll an opposed grapple check. Yes, while this uses the rules from grappling, it does not specify anywhere that you or the target are considered to be in a grapple.
3. There is no required opposed grapple roll for the opponent to escape, they simply DC15 Strength or Escape to break free.

I think the only reason you make a 'grapple' check at all is to include all relevant size/skill factors. A Huge creature's arrows would basically be the size of a javelin to a small creature, so it stands to reason that bigger projectiles pin more successfully than smaller projectiles.

It doesn't specify that you or your opponent are considered to be in a grapple, nor does it specify that normal grapple damage applies (or constrict damage for that matter). It simply requires you to make a roll that uses all relevant bonuses for grappling in terms of size and strength.

A grappled creature can use its action to escape.

It says an action, so it requires an action. If it could be done as one of several attacks, it would say so, just like it says for making a grapple.

If you're the DM, you can houserule this, of course, but think carefully before doing so, because allowing one attack of Extra Attack to escape grapples vastly favours the players. There are some monsters that are only dangerous because of grappling, so making it easier to escape a grapple is fairly crippling for them. Also, due to the way Multiattack works, this will only make it easier for players to escape monster grapples, not for monsters to escape player grapples.