Why you need to submit everyone to your submarine-swap service... Make this an in-app service!! And relieve the rest of the people who just need those lightning sats available in the LN itself!
The idea of forced-fees is agains the btc idea! muun charges 2500 ppm or 0.25% just for Muun HOP.
You can measure like this:
Onchain transaction: 1 sat/vb = 500 satoshis (for ANY AMOUNT of bitcoins you wish to spend) - blockchain is empty nowadays... You can have 1 sat/vb confirmed within hours!
If I send 5 million satoshis (0.05 btcs) to someone on giveas a muun invoice: should cost 12,500 satoshis... the usual onchain fees to confirm next block is around 10 sat/vb and thats around 2600 satoshis, it means that by using lightning through Muun which meant to disrupt the high-fee blockchain you end up paying 5 times more fees than the previous one tech!
Please Muun, stop abusing the noobs!