I personally don't see the need to pay the expensive prices required by those command strip hooks. Something cheap, like a good removable poster putty, can do just fine and last you a lot longer (and is cheaper!).

I use this stuff to mount all my Perler beads on the wall at my home and at the library where I work.

http://www.amazon.com/gp/product/B000BQMFEC?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

Also, there's a bajillion people here who would likely be willing to do the Scott Pilgrim characters for you, possibly for cheaper than you're seeing on Etsy. Shop around!

No prob. It comes in little bricks and you pull off however much you need

https://www.amazon.com/gp/aw/d/B000BQMFEC/ref=mp_s_a_1_1?ie=UTF8&qid=1519649123&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=wall+tack&dpPl=1&dpID=51xwrPsViRL&ref=plSrch

Poster Putty great when you have delicate items to solder, holds stuff in place without having to mess with grippers and clips.

Gorilla Clear Tape I use it to keep my RX in place and under all my ESCs in combination with zip ties. Some of the stickiest stuff I've found yet and I run a sign shop so I deal with adhesives all the time.