Yep. Welcome to 'compromise'.When I tour, especially in the west, temperatures can change drastically in a relatively short period of time from the very cold mountain elevations to the very hot valleys and deserts – nothing you guys don’t already know. Historically, I have had to carry two complete sets of gear; mesh jacket/pants and heavy Fieldsheer jacket/pants with pant liner and heated jacket liner.
I guess I was looking for ideas that would allow me to use one set of outerwear while only needing to change the internal liners.<...>
So, here's the real problem you'll have.
You started the day with those liners in both pants and jacket, and you experience that 40 or 50 degree temp shift in a morning of riding. You're now at a point that you'd really like to rid yourself of the liners.
Well, the jacket liner? That's easy. Zip, snap and it's out. If you wore a long-sleeve shirt, or even a heated jacket liner - easily removed and stored.
What about the pants liner? Some may be easily removed, but others? You're removing those pants someplace in order to remove that liner. 😲
[I'm referring to riding pants that have an removeable liner, mainly used for wet, but could be used for cold abatement.]
I will only carry one set of gear, and that's on my person. I have accessories to that which is either in use or stowed, along with my wife's set of gear & accessories and off-bike clothing for a few days.
There's a lot of other threads on this subject (as seen thru the 'Recommended Reading' links when this thread is viewed on a computer) and you're just in the same spot as nearly all riders are at some point in their riding time.