Hi @Wolverine,
I agree with @MartinLangmaid - the Transit Duo CAT12 Primecare is an excellent upgrade choice.
However, if you want to avoid upstream NAT, you could try out Peplink’s new SpeedFusion Cloud service and route all of your traffic over that connection - instructions > Here <
This is free for 90 days, after that there are payment options or alternatively, you could host your own FusionHub Solo (which is free) on a Cloud based platform (like Vultr) for $5 a month. @MartinLangmaid helped another post with this and they’ve provided instructions to set this > Here < Scroll down to the bottom of the post for a newer FusionHub image.
I hope this helps,
Steve