I believe then your best bet is to modify your Handy’s receiver similar to how people stuck two fleshlight quickshots together as then with the right receiver you can stack an Handy open ended sleeve below and close ended sleeve.
Maybe something like this? Craft a velcro tape loop to hold the fleshlight quickshot in a tube
You can also try switching to it seems Tenga Spinners as an search of the site brought me to this topic in the past: Closed Sleeve Suggestions for The Handy? - #3 by rr806767 There may also be other options as well that will appear if you search for them and such on this site.
Upscale/FPS increase request topic , Video resolution mega poll and recommended multi-axis script along with single-axis script which is a Fap Hero.