LT, UK and CH are the probably in 'regulatory light' area's.
Depending on your target market you can choose any of them.
Brexit might withdraw EU passport rights, so I would not recommend UK for now.
To get up an running (legallly/regulatory) (and have a real bank instead of an EMI) in LT will costs you arround 1 mio EUR.
To get up and running (legally/regulatory)(and be self regulated EMI) in CH will costs you also 800,000 CHF.
To this you need to add:
- banking software (you can outsource this to fi. fidor.com, ophen.com)
- compliance (you can outsource this, but when asking here︀ you might want to this yourself to get an 'advantage'.)
- fraudhandling (you need outsourced︁ resources for this, this is a key area! You can loose a lot of money︂ easily!)
- contract with MasterCard, Visa.
- if you outsource you core, they will provide︃ IBAN, SWIFT etc.
- Card handling can be outsourced too (WaveCrest 😉, or others, but︄ you want to take this in your own hand asap.)
If you want to develop︅ a niche, you might consider setting up an EMI in CH, and issue UnionPay cards,︆ and accept crypto.