Salute!
It's good for some to realize that you do not have to increase speed/AoA to climb or descend.
Now, ya gotta be gentle with the throttle(s), but a well-trimmed plane (or one with max AoA command in the FBW planes) will climb or descend nicely using only power changes.
Would be interseting if any of the "modern" planes with "speed" mode on the AP would allow throttle/power changes made manually to control climb rate.