A used Motorola XTS5000 Model 1 would be a great option for your requirements, but be aware that it is not FCC Part 95 Type Accepted.. Not that the FCC will care, but "some people" here on the forum will stroke-out if they know you are using it on GMRS.
All GMRS and FRS radios manufactured since 2017 use/share the same frequencies for channels 1-22 which are simplex, so yes, you will be able to say "go to channel 7" and talk with everyone as long as someone didnt buy one of those shitty radios that comes pre-programmed with tones/codes (most do not).
Search for FCC form# 601 ... Watch the LMR part of this video for more infos:
https://youtu.be/fuErcUjv_fA
Edit/update: I dont know anyone (including myself) that has actually applied for a business license themself - everyone I know paid a company/service to do it for them.
I have had/used the KG-1000G, the 1000G+ and the DB-25... The DB-25 is probably my lease-favorite radio, and the KG-1000G+ is my mostest-favorite Part 95 GMRS radio, with the older 1000G right behind it.
I need something better so i can calibrate my Fars-O-Meter 2000!
I am also looking at some of the MFJ's but I want something that "some people" wont declare is just 'junk' and i'm not sure where MFJ falls on the home-expert's scale of "just junk"...
Curious what some good, accurate, well-respected power meters are. I know Bird is the gold-standard but I'm looking for something not quite as expensive. Not just something that works well and is accurate, but something that "experts" would respect.
When I first set up my 2 KG1000s as a repeater i had significant desense limiting my fars. But after separating the radios by several feet and putting one of the radios in a vented metal box, I was able to get a 20+ mile range.. I am high-up on a hill though so your fars may vary.
Almost forgot:
A lot of sad-hams like to slum on GMRS - so turn on your roger beep, then kerchunk the repeater a few times - They'll come at you like The Walking Dead...
Some areas are, mostly because GMRS is intended for purpose-use. ie; when you go hiking, off-roading, etc, to talk with others in your group. Its not primarily intended for chatting with strangers.