First off I am glad to see you have not chosen the easy road to simply ignore me, it raises my opinion of your character even if I disagree with your views, some of them more vehemently than others.
Thank you, i suppose we all cannot agree with every single issue of mutual interest, but ability to hear each other out is a sign of crystallized cognitive ability. If we can maintain this aspect, than we can keep a mature rapprochement platform where we can discuss objectively.
That article you posted does mention a desire to improve relations with all other countries in Asia as part of the LDP platform, though not part of the constitutional reform, but it sounds like boilerplate to me, something no one would disagree with and a general interest that anyone would have for their own country, but not something that will be pursued at the expense of all other interests.
Well that is the paradigm of Omnidirectionality of Japanese Foreign Policy. I don't know if you have read into Japanese Foreign Policy objectives prior to 1980, and present. I thought i should provide some data for you to read upon:
A tipping point for Japan’s foreign policy - FT.com
Japan, the Fukuda Doctrine, and ASEAN on JSTOR
https://revistas.ucm.es/index.php/UNIS/article/viewFile/44792/42219
http://www.stimson.org/images/uploads/research-pdfs/burnspdf.pdf
Even more telling, the LDP has deep ties to the Nippon Kaigi, a right revisionist organization, and not pro-China by the sound of it given their support for visits to the Yasukuni shrine and their claims of exaggeration of the Nanking massacre.
The Nippon Kaigi is indeed a deeply patriotic organization for politicians, but to say that LDP parliamentarians and ministers are sole members of the organization is a bit biased, since the organization has over 35,000 members. The LDP is the largest political party hence it will have a considerable membership.
The group describes its aims as to "change the postwar national consciousness based on the Tokyo Tribunal's view of history as a fundamental problem" and to "revise the current Constitution." Norimitsu Onishi considers that the organization promotes a revival of the fundamentals of the Empire of Japan. The nationalist movement sees its mission to promote patriotic education, the revision of the Constitution of Japan
In the words of Hideaki Kase, an influential member of Nippon Kaigi, 'We are dedicated to our conservative cause. We are monarchists. We are for revising the constitution. We are for the Glory of the Nation."
While I think it is still wildly optimistic in my opinion that a change in the constitution would herald better relations with China, it is not out of the stadium to hold that opinion that that is what they are going for, though I do not see China being happy with any move that brings Japan closer to what it was before WW2 initially. It would dredge up bad memories and possibly worse.
This is where you and I come at an impasse through our fundamental differences, my friend. Where you see a barrier, i see an opportunity.