Arizer list a great quality silicone whip for the EQ, it's a good diameter and is versatile, I'm almost sure it'll interface with the Mighty's mouthpiece. It fits a DynaVap M snugly and can be stretched over a grasshopper mouthpice, if that's any indication.
https://arizer.com/store/extreme-q-parts-accessories/
They are currently running a 25% off sale too, but I've bought from a local shop so it could be worth shopping around to save on shipping depending on where you are.
Alternatively, 7th Floor sell a non-siloxane whip that comes in a range of nice colours. Unfortunately it's probably too wide for the Mighty.
It might be worth a read up on siloxane, or silicone as it is marketed.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4884743/
In my opinion it is definitely worthwhile sourcing a quality material considering the nature of vaping. Silicone whips absorb the oils that condense inside them, causing smell and potentially an unhygienic vapour path. They are also commonly unable to cope with the heats required with vaporising.
It's a relatively safe material, but IME it needs replacing quite often and is impossible to properly clean.
The key advantage with premium options like the Arizer whip, is the smoothness of the inner bore and the purity of the material.
If you want silicone, that's your best choice.
IME the best whip is the 7th Floor SSV whip though, which does not absorb oils and is extremely smoothly bored.