You can associated any altcoins at you desire, in fact, it was an alternative payment option but of course, choose the right altcoins for your project as this also impacts your product's demand. Some merchants are also using this strategy but they often accept known coins like BTC and ETH which I think it was a good choice rather than choosing unpopular coins.

Apparently, there is no problem provided that you can manage it well. It is just adopting cryptocurrency but you can't expect a fast response from the community.