You'd have to ask Adobe about that. We are just users of Lightroom here in this forum, not Adobe employees.
You could try a third party, such as Amazon, if it's available in your country and if they support those payment types.
iDeal appears to be Netherlands-only, and Maestro appears to be a MasterCard debit card with special handling requirements for added security. I’d guess both are too limited in their revenue stream to warrant the extra programming (or fees) on Adobe’s side to bother with at this point or it may be as simple as Adobe doesn't use a card processor that accepts these forms of payment.
Is there something special about your situation that removes PayPal from consideration and can you not just get a MC- or Visa-branded debit card from your bank?
An alternative mentioned in a previous reply, is that you can buy an annual subscription from Adobe resellers, and perhaps those will accept your chosen forms of payment.