Would seeking an active duty commission be a good idea if it results in becoming a dual military couple in different branches?

If was difficult for me to find a retention NCO that knew about direct commisions in the USAR. Depending on branch and how you plan to commision will determine who you need to contact.
If you have not completed your contractual obligation, you may need to requet a conditional release before being able to commision with any other branch.
Being seperated by branches and duty locations can take a toll on marriage. If you go active duty into a difference branch of service, expect to be georaphically seperated.

I you are in different branches of service it is extremely unlikely that you will be stationed together.

As I read your profile, you're an LPN (non-degree?) and your husband is in the process of training as an active duty Soldier. Language school indicates he may be going into an intelligence related specialty. If USSF is looking seriously at you applying for a commission, then you must have at least a bachelor's degree. We could really use some more details.

Based on working in unified commands with service members from all Services, I will say that married life for military couples is difficult. The Services do their best to station married service members as close together as possible, but it doesn't always work out. Take a serious look at where service members in both of your MOS/AFSC are stationed. If the larger populations overlap, then you may get to spend some number of years together. But, a lot gets in the way, such as required remote, unaccompanied tours to locations where the spouse's MOS/AFSC doesn't have any jobs available.

There are some other factors:
-If you want to work in the nursing profession and you have additional degrees and qualifications beyond LPN, then a direct commission to active or reserve component is possible. Medical personnel are needed at almost every military installation of any size. This increases the opportunity for a joint-spouse assignment
-If you're picking a new MOS and applying for OCS, then select a logistical or IT MOS. Almost every installation has supply, transportation, finance, contracting, and IT functions that need officers. Again this increases the opportunity for joint-spouse assignments.
-Do not choose high-demand, low-availability MOS, such as Special Operations, because there are very few installations with those MOS in abundance and you will likely be deployed often. Not good for joint-spouse.