How to change coupling for KATO Pocket Line engine?

[Dillon]

Since I'm planning to operate some of the Kato Pocket line models, I looked through Amazon and saw that the KATO N Gauge Chibi Convex Set has these funky couplings that my Southern Pacific observation car has(https://www.amazon.com/gp/product/B07R46SS4G/ref=ox_sc_act_title_6?smid=A28V1QXS53MQKP&th=1), and I'm planning to convert them to the standard KATO couplings that most of the rolling I own, for the reason is that I'm planning to operate with American cabooses, as caboose hops and probably some passenger excursions. Still, I don't know what materials to start or how to convert the model in the link safely so I won't damage the model, any tips will help.

 

-Dillon Trinh

Edited July 15 by Dillon
Added some info

[bill937ca]

Be aware the Pocket Line steam locomotive is not powered. The power unit is under one of the coaches.

[Dillon]

1 hour ago, bill937ca said:

Be aware the Pocket Line steam locomotive is not powered. The power unit is under one of the coaches.

Odd that I didn't get a notification from this comment, but anyway, I did not know that, thanks for telling me this, though I'm interested in the electric locomotives of that line.

[Kingmeow]

Then get this although you may have to repaint to the color of your choice.  This is from Kato USA so it will have the "standard" Kato couplers for their US products.

 

https://www.amazon.com/Kato-Pocket-Steeple-Electric-Locomotive/dp/B097HJYM8T/