Benjahmin, I’ve been through a similar process as my arthritic thumbs grew more and more uncomfortable while riding. I’ve always liked Shimano’s Rapidfire Plus shifters, but I ended up not able to use them regardless of how well setup / slick they were.
I went through a series of alternatives. Initially I tried an old set of DuraAce bar-end shifters, but mounted as ‘thumbies’ on the bars. Next up was a set of SRAM Gripshift shifters – 9 speed right, 3 speed left. Both options worked well for a while, but I had to give up with the right shifter as it was just too sore to use for more than about 10 miles.
Wireless shifting could have been an option, but I wanted to stick with my hub motor rather than change to a mid-drive. The Hyperglide compatible freehub on my Shengyi DWG22C rear hub motor (limited to 10 speed cassettes with a smallest sprocket of 11) ruled out swapping (at great expense) to either Shimano or SRAM 12 speed wireless shifters as they both use different types of freehub bodies.*
The solution I found was from Archer Components, a small Californian company. They made a wireless shift system which was compatible with any type of rear derailleur. You can Google for the details. I set mine up with 2 x shift buttons which I could operate by simply squeezing with my fingertips – bliss! Unfortunately, Archer have now closed down so that option is no longer available.
*However, I’ve been rummaging around the internet to see what options I’d have when my Archer setup finally gives up the ghost. It appears that SRAM now make 12 speed cassettes which will fit a Hyperglide freehub body. This would allow the use of a SRAM 12 speed wireless derailleur with my Hyperglide freehub body. Additionally, a Dutch company ‘Leap’ make shift buttons to match SRAM blip wireless buttons.
None of the above are cheap options, but if the choice is between riding and not riding, then at least it’s good to know that there are solutions available. I hope to be using my Archer solution for several years yet, but I like to know there are some alternatives available.