I don't think the turn is a stand cbet, it's the worst card in the deck for us and we should not expect them to fold anything that called the flop other than high cards like AQ/AK.

River also pair's the board making it less likely we flopped a set or two pair hand.

Calling the flop and checking back the turn looks best to me.

More -EV advice from Harvie who hasn't read the hand....

Fold pre even deep. Raise flop, once he check turn ofc bet! @Harvie When people x OTT they will x/f like 60% with a missed cbet, and ok this spot might be slightly lower as he x/c some TP and over pairs to "pot control" (even though that idea is stupid as the 2 makes no difference) he will x/f 40%+ and we have a straight draw + over card to TP so our equity + his x/f makes the turn the easiest bet ever!

River I honestly don't know at these stakes, it is pretty hard for us to rep 5x or 2x here but we can have 88 99 TT JJ QQ so I don't think bluffing is horrible at all and unlucky he called you down.

What about 3b preflop? Would it be too much?

yes

Hey guys, what about, since we got ourselves into the hand anyway - and I think this was a fold pre without special reads but whatever - raise flop, barrel turn and ship river? Or too thin and spewy?
Thanks.

Pre: Calling deep here seems fine to me. I don't like three betting an UTG open here with this type of hand.

Flop: Given villains sizing here I wouldn't be a fan of raising flop as suggested above, raising is obviously never going to be terrible here but my preference would be to flat call with the intention of getting aggressive on a decent number of turn cards.

Turn: Betting here seems fine, villain has not shown much strength at all here and we should get a decent number of folds from hands where villain was taking a stab on a dry board.

River: Betting here seems bad to me after turn bet is called as I would expect to get a lot of calls on this runout. There are a ton of cards that we can bet big here with the intention of folding out 7x/88/99 type hands but betting here seems like a spew to me.

Pre is a 3 bet or fold. Axs make great 3 bet bluffs IP. That said I would prefer using the wheel Ax than A7s.

Flop is a standard call.

On the turn I would make a tiny bet to get him to call with his decent Ax overcards, and maybe wider. If he calls he will likely check to us on the river allowing us to check back, rather than checking the turn putting us in a guessing spot on the river.