Regarding becoming a Phil citizen and giving up US citizenship - Agreed, a very complex and slippery slope. All persons considering such an option should carefully review the requirements according to the Section 2 of the Revised Naturalization Act of the Philippines.
Regarding Filipino wife and foreign spouse's names on TCT title as owner to the lot - The safest way to have any rights as a foreigner is to make sure the new TCT or the bill of sale read “Sue Doe, married to John Doe a foreigner”. This measure and it's effectivity is limited to the foreign spouse holding a 13 series visa on up to 1,000 square meters of land.
Nearly all banks will gladly accept the foreign income to qualify for a home loan and expect the foreigner to pay in case of spouse default. I would like any person to show that they have a land ONLY loan with a foreigner as the joint or sole owner on the TCT document (excluding the sales contract).
Any office that records a foreigner as the sole owner or joint owner is in violation of the Philippine Constitution. In any court action, the foreigner will loose and risk the property TCT being declared void. This topic is found in the Philippine Constitution where it (under Article XII, Section 7) states,
“Save in cases of hereditary succession, no private lands shall be transferred or conveyed except to individuals, corporations, or associations qualified to acquire or hold lands of the public domain.”
The "qualified to acquire or hold lands of the public domain." is the key phrase. Meaning those qualified are:
1. Filipino citizens.
2. Corporations at least 60% of the capital of which is owned by Filipinos.
Only after the above has been accomplished and only if the Filipino spouse passes prior to the foreign spouse, it is possible for the foreign spouse to inherit and keep the land in his/her name permanently as the 100% owner of that land only.
There is a related rule that allows a 13 series visa holder to retain such visa status permanently upon the death of the Filipino spouse.
As another part of this related topic, one can research how PRA controls the release of funds for foreigners on RFO vs. Pre-selling units. It can be said that RFO (Ready for Occupancy) are the only properties allowed by PRA for SRRV holders to release their required deposits for such purchases. This topic area will get into the CCT vs. TCT requirements again as noted in other posts.