1) @SwanHunter I expect would be better able to provide an answer. I believe you need to take a class, submit the application with cert, pay the fee and wait like everyone else. IANAL. IL residents are taking months (and often many more months). There have been a few who discussed this process moving to an approved state at IL Carry. Of interest though that cames to mind is if you need to retake the same class you took as an IL resident and submit a new cert from a class thats going to cover the same material or could use same cert...
Not sure if the FCCL statute covers this in any detail. I expect not.
2) Once moving, how long does TX give you to get a resident DL? I think IL gives you 90 days if moving here. If items get moved before you get TX DL, you would still be storing as an IL resident, no? IANAL. Once you get the TX DL, in theory, they take your IL license, notify IL who will cancel the current CCL.
Once becoming a TX resident with TX CCL, you do have the legal option for concealed vehicle carry until you have your IL FCCL.
IL FCCL
https://www.ilga.gov/legislation/ilcs/ilcs3.asp?ActID=3497&ChapterID=39(c) A resident of a state or territory approved by the Department under subsection (b) of this Section may apply for a non-resident license. The applicant shall apply to the Department and must meet all of the qualifications established in Section 25 of this Act, except for the Illinois residency requirement in item (xiv) of paragraph (2) of subsection (a) of Section 4 of the Firearm Owners Identification Card Act. The applicant shall submit:
(1) the application and documentation required under Section 30 of this Act and the applicable fee;
(2) a notarized document stating that the applicant:
(A) is eligible under federal law and the laws of his or her state or territory of residence to own or possess a firearm;
(B) if applicable, has a license or permit to carry a firearm or concealed firearm issued by his or her state or territory of residence and attach a copy of the license or permit to the application;
(C) understands Illinois laws pertaining to thepossession and transport of firearms; and
(D) acknowledges that the applicant is subject to the jurisdiction of the Department and Illinois courts for any violation of this Act;
(3) a photocopy of any certificates or other evidence of compliance with the training requirements under Section 75 of this Act; and
(4) a head and shoulder color photograph in a size specified by the Department taken within the 30 days preceding the date of the application.
(d) In lieu of an Illinois driver's license or Illinois identification card, a non-resident applicant shall provide similar documentation from his or her state or territory of residence. In lieu of a valid Firearm Owner's Identification Card, the applicant shall submit documentation and information required by the Department to obtain a Firearm Owner's Identification Card, including an affidavit that the non-resident meets the mental health standards to obtain a firearm under Illinois law, and the Department shall ensure that the applicant would meet the eligibility criteria to obtain a Firearm Owner's Identification card if he or she was a resident of this State.
(e) Nothing in this Act shall prohibit a non-resident from transporting a concealed firearm within his or her vehicle in Illinois, if the concealed firearm remains within his or her vehicle and the non-resident:
(1) is not prohibited from owning or possessing a firearm under federal law;
(2) is eligible to carry a firearm in public under the laws of his or her state or territory of residence, as evidenced by the possession of a concealed carry license or permit issued by his or her state of residence, if applicable; and
(3) is not in possession of a license under this Act.
If the non-resident leaves his or her vehicle unattended, he or she shall store the firearm within a locked vehicle or locked container within the vehicle in accordance with subsection (b) of Section 65 of this Act.