I too have a similar problem, currently a NPPL holder using a DVLA based Medical Declaration, soon to expire.
Having looked at the new form srg1210, I will have to see an AME for a LAPL certificate due to heart surgery 15 years ago.
Having looked at the LAPL med160 form, the list of "lifetime" conditions is extensive and seems far beyond DVLA requirements.
My concern, (apart for refusal to grant a certificate), is that the AME may require medical tests and possibly referrals to specialists, which could be very costly!
Is the CAA trying to "ground" older pilots? I thought the principal of the new "self Certification" was to reduce bureaucracy and encourage GA!