If you do it with an 11-speed chain on your 7-speed cassette, the rear shifting will be laggy, although once it's on a gear it will work.
The better way to do it is keep using a 7/8-speed chain, and space out the front chainrings a little to avoid rub and involuntary pickup. What I do that just works most of the time is use a Wheels Mfg 0.6mm chainring spacer on each chainring bolt. With FC-R7000 and FC-5800 you'll be doing it on the inner ring if you can so as to not disrupt the flowy 3d look of the outer ring and spider. Other companies make them in smaller increment sizes, and if that's what you come up with you can just use a stack. You're simply going for spacer equal to half the width difference of the chains in question.
Some Dahons have very short chainstays. That will exacerbate chainring rub if so. That's what the spacers are trying to solve, and they usually can, but short chainstay bikes are the situation where some trial and error tuning can be needed, so having the 0.1mm spacers to play with may be handy.
Always pair the FD you use to the chain speed generation to avoid problems with either rub or the cage gap being too wide.