Bar end shifters onto a flat bar - temporary fix solution I have a bike in progress that will use Shimano bar end shifters, but I am putting on a Jones Loop Bar. I am ordering a set of Paul's Thumbies, but they will take over a month to reach me. In the meantime, my bike is my only vehicle.
I am looking for how I can set it up in the interim until my Thumbies arrive.
One solution I have seen is using hose clamps, one around the stem and one around the base of the shifter, to attach it to the bike.

Another option I am considering is to put the bar ends into an accessory bar like this one below. I know the external diameter is 22.2 mm but nowhere lists and internal diameter. It is on a webstore, not a local shop, so I cannot just go measure it myself.  
Has anyone dealt done a similar conversion and have any success?
Does anyone have other suggestions for how to get it to work for three or four weeks?
Thank you!
Go find a scrap donor bike - either check at the local refuse-resell shop, or a bike cooperative.   You're after one with friction lever shifters.
A simple friction shifter will move as many gears as you want, and won't cost a lot.  They're super-versatile and are well-worth holding onto for situations like this.
I used one to shift a quad-chainring bike, and it worked really well for that purpose.