yes liquid is harder to work with, but honestly personaly i prefer the liquid (i have the two, gel and liquid, liquid penetrate better imo and if you do it properly unlike the gel when you press there is nothing that comes out, after it is a preference! you have to be very careful and put very little! otherwise yes use the gel! it is a lot easyer to work with the gel for sure
edit: yes gel and liquid are the same glue, cyano, just the consistency change... the liquid flows, the gel does not flow (if you don’t leak everywhere or you don’t put too much there’s nothing that cracks with liquid, on one side it penetrates the felt and on the other it will just stick when you will push, nothing more, that's why i said i have good result with otherwise I would not have recommended)
ps: i'm a 1/8 RC Team Associated buggy/truggy guy so i have a lot of different cyano, i use it a lot to stick my tires

(RC8B3.1E my baby! lol, i'm a old children finally

), in RC we never use gel... (you can but it's better with liquid), for info RC cyano is one of the best quality of cyano you can find (and we find all the consistency... liquid, semi-liquid, etc... either way you need a good cyano otherwise it won't hold (loctite glues are ok

)
i have also pattex shoe glue / pattex shoe glue sneakers but never try (contact glue), to say I don't even know if by drying it is transparent ^^ I will have to try one day, if you have the front completely decolled it must do the job if transparent (if it's only for a little corner: superglue!), I had planned these glues to try for soleswap but i never needed... for the moment lol (yes i know we can find better for soleswap, pattex are just for test! they are easy to find on the market)