In theory yes but some Immigration Offices will not issue the 60 day Visit Thai Family extension on a tourism entry stamp and others will only issue this if the 30 day tourism extension is taken first. The answer is the OP qualifies for a Non-O marriage visa which gives the required 90 days on entry so Immigratrion will be pushing more in this direction now.
Will you get a 30 day extension on a land border Visa Exempt entry? I've not seen the official announcement that was due today. What you could do is take the 60 day "Visit Thai Family Extension" before you border bounce so that you don't need to extend your entry stamp to get your 6 months.
Try messaging the RTE London on Facebook which I have done in the past and got my visa hours later. Give your name, passport number, application Request Number etc. when communicating.
Mine is due in January and as I will be renewing on a Non-O visa not a 12 month extension I am expecting to get another 2 year provisional licence (Sa Kaeo province)
If you're in a major town/city there probably is very little difference in the quality of True and AIS services but if you are rural then one may be better (ask the locals which they use)