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Frequency coordination is not really official. They really have no power to stop anyone from doing anything.  All the FCC cares about is interference between users. FACT, if someone has a parked frequency pair, for amateur radio, but it's not used, and you put up a repeater, the FCC will not give a damn.  If there is no interference, there is no problem.  frequency coordinators do not own the frequencies. If they file a complaint with the FCC and there is no interference, the FCC won't care.
 
To the person who wondered if DMR will work on GMRS, of course it works just fine.  In fact, if DMR is ever adopted, it will greatly expand the use of GMRS.  But FCC is always making sure that changes are backward compatible.  Fact is DMR would reduce a lot of interference.  That's what it's designed to do, and you get double the capacity, if not more. Two conversations can take place simultaneously on the same frequencies.
 
Regarding how long it takes to transmit a text. This example is "I'll be headed home soon".  It was transmitted in DMR message, into a dummy load, and i real time speed.  You can hear the beep, when the message was sent.
 
msdsite.com/DMR/dmr.mp3
 
But being legal is an entirely different matter.

No. Part 90 is not your party line.
 
90.403(a), (d), and (e) all limit your communications to only the permitted uses in 90.405, and ( will hold the licensee responsible for any violations, regardless of who is transmitting under the Part 90 license.
90.405(a)(2) limits your communications to transmissions directly related and necessary to your Part 90 eligibility. Unnecessary communications clog up the limited frequency pool for other eligible Part 90 licensees; they too are paying for a license, and interfering with their essential communications with your non-essential communications can warrant FCC investigation.
90.427(a) makes it extremely unwise to publish your operating frequency and access codes to the public, as you become responsible for a stranger's operation. 90.433© also makes you responsible for their radios, and 90.443( expects you to have some sort of Part 90 compliance information for each radio used, in addition to records of all maintenance. If you're not in direct control of the radios used on your license, station inspection (which you're making yourself an easy target for) will get messy.
 
If you're claiming eligibility with some purpose you stretched the truth to make, most of your communications won't be necessary and incidental to the operations stated in your eligibility, violating 90.403. If you make up a purpose you have no intention of fulfilling, you're lying on an official form submitted to the federal government and committing a crime; furthermore, you will not be making essential communications as the eligibility does not exist and no essential communications can be made, further violating 90.403.
 
If you're going to get a commercial license because you are performing commercial activities, go right ahead. That does not authorize you to use a Part 90 authorization to do your Part 95 activities. That is what Part 97 is for. I won't condone the recommendation of Part 90 when the stated purpose of operation is in conflict with the FCC rules and better fulfilled by other services.