OK, no node. Although don't dismiss it totally. Running your own node, especially for a business, is a must. IMO. 

So first, have you tries nostr:nprofile1qqsrf5h4ya83jk8u6t9jgc76h6kalz3plp9vusjpm2ygqgalqhxgp9gpz4mhxue69uhk2er9dchxummnw3ezumrpdejqzyrhwden5te0dehhxarj9ekxzmnyqyt8wumn8ghj7un9d3shjtnwdaehgu3wvfskueq555fk2? #zeus wallet turns your phone into a node. You use their LSP (lightning service provider) by opening a channel to #Olympus. I believe it is also integrating bolt12 which would allow for a static address to receive payments.

Then there is #Muun wallet. Strictly not a lightning wallet as it uses submarine swaps to send on the lightning network. That is it is a normal btc wallet that you send from. It's not 100% effective but worth looking at.

Finally there is nostr:nprofile1qqsqcdcltmv4qanpx3p7svcufdsg9rkk00x7l2sknra4e6whkv59l7cppemhxue69uhkummn9ekx7mp0qythwumn8ghj7un9d3shjtnswf5k6ctv9ehx2ap0qywhwumn8ghj7mn0wd68ytnzd96xxmmfdejhytnnda3kjctv9uke3478. Now this is a web based app that you can use to swap on chain to lightning and vice versa. It isn't really what you are looking for but worth your time for all sorts of reasons. 

In reality, the best solution is running your own node. It really is easy. Yes there can be an initial outlay but it doesn't have to be so expensive. You can buy plug and play nodes, go for #Start9 although I have an nostr:nprofile1qqsw5t3us9xs3gmclzjm37hvk2yy6pv9t96utjjttsj794hexc5x79qpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhs4njjxr still. I use a #RaspberryPi but an old mini PC will work and you can pick them up for £40!