For what it's worth, we did a visa run, return from Chiang Mai to KL at the beginning of August. We had the baht but we weren't asked for it upon our return to CM.

I just got an SETV in Kuala Lumpur Kyron. The 60 days activates once you arrive in Thailand, but the you have to arrive within a certain time-frame as stated on the visa. I don't have my passport with me but that time-frame is maybe 3 months.

Cheaper than uber as well by at least Ringgit per ride.

If you take the train from Airport to KL Sentral Station, it's 100 Ringgit per person return (55 one way) but a Grab is 65-75 so it's cheaper if there are two, or more, of you.

Edit: But probably 1 hr (or more depending on traffic) vs 30 min by train.

We stayed at Signature International Hotel @Pudu.

$125 CAD for 5 nights. Room was small but clean, with attached bathroom and a separate shower. The staff were friendly and helpful. You can book the room with or without breakfast. Good food options nearby.

It's within a 10 minute walk to Jalan Petaling (China Town), Bukit Bintang (bar and club street) and Jalan Alor (street food market). Also within a 10 to 20 minute walk of a couple of mass transit stations. Most rooms have a view of the city. Picture below is from the 4th floor and I think there are 8 in total.

It was a 15-20 minute, 7 Ringgit (55 baht) Grab ride from the hotel to the Thai Embassy.